In a French high school, Raphael spends his time in class working on his sci-fi book instead of
paying attention to teachers, which often gets him in trouble. He's been working on this book
for three years, and the protagonist's Rapahel's self-insert. His best friend and ping-pong partner
Felix is supportive of Raphael's dream even if he isn't allowed to read the book yet,
although he always points out that the protagonist needs a good love interest for the story to work.
One evening after class, Raphael hears a beautiful song and follows into one of the school's many
abandoned rooms. There, he finds fellow student Olivia playing the piano with admirable skill.
However she stops playing when she notices Raphael because this is supposed to be her secret spot.
Raphael apologizes and compliments her piano skills as he steps back, accidentally pushing over
a statue and activating the room's alarm. Olivia wastes no time and drags Raphael with her to run
out of the building before they're found, and what begins as panic soon becomes laughing at these
shenanigans. When they reach a bench outside, the pair exchanges names and shakes hands, and it's
at that moment that Raphael realizes Olivia is the perfect love interest for his story and himself as
well. Afterward, they fall asleep together on the bench. The next day, Raphael's in an awful mood
because he realizes he's lost his notebook, and now he'll have to rewrite everything from scratch.
Fortunately Olivia found it in the piano room and brings it to Raphael while admitting she read it
all and really liked it. After some friendly chatting, the two of them kiss to start their
new relationship. Raphael and Oliva get along extremely well and their dates together are lots
of fun, going from experiencing new kinds of food to carving their names on the bench where they
fell asleep together. Olivia is very supportive of Raphael's writing and helps him come up with
ideas, she's also the one that gets to read everything first. They go to college together,
and every Sunday they visit Olivia's grandmother Gabrielle, who gives Raphael her beloved ring so
he can propose to Olivia. Olivia of course accepts, and the wedding goes wonderfully.
The married couple moves to their own apartment with the help of Felix and his girlfriend Morgane,
and every day Olivia makes dinner for Raphael by making cute and funny shapes on his plate.
Raphael surprises Olivia with a small piano of her own, and now she can practice at home more often
while he writes. Olivia starts entering music competitions and small local concerts to build
up her career as a musician, Raphael always makes sure to go see her shows every time. When Raphael
finishes his book, Olivia likes it so much that she sends it to a publisher without him knowing.
This turns out to be a great idea because it gets Raphael a publication contract, and he hires Felix
as his manager. Soon Raphael becomes very famous, and while at first this is great because it gives
them things like a bigger apartment, soon the mood at home becomes very tense. Raphael is
always busy at some party or interview and he's almost never around, leaving Olivia's cute meals
abandoned on the table. To make matters worse, he starts missing Olivia's concerts and he doesn't
even mention her when he talks about the writing process he went through in interviews. All this
stress and sorrow deeply affect Olivia's performances, and when she begins losing
competitions, she gives up her dream and becomes a music teacher. One evening, Raphael comes late,
but he barely says a word to Olivia before sitting down to finish his next book. The hero must choose
between his girlfriend and the world and he chooses the world, letting the bad guys kill
the love of his life. Olivia points out that this time, Raphael hasn't allowed her to read anything,
unlike the old times. Raphael tells her he isn't in the mood for an argument because tomorrow
he has to discuss the movie deal and visit a school, and when he accuses Olivia of nagging,
she finally snaps. She's tired of eating alone and Raphael constantly ignoring her, it's time to
admit their relationship isn't going well and that she's unhappy. Shocked, Raphael wonders if she
doesn't love him anymore, and Olivia confesses she isn't sure, causing Raphael to stomp out of the
apartment and go drink at a bar. Still attached to her old tradition, Olivia reads Raphael's new
story as it starts to snow outside, and she is incredibly hurt when she sees the love interest
dies. Raphael comes back late in the night, and neither of them says a word before falling
asleep. The next morning, Raphael oversleeps, so when he wakes up he hurries out of the apartment
to get to work without noticing the apartment has changed and assuming Olivia's avoiding him. Felix
is waiting at the door for him as usual, but instead of his fancy car, he's brought an old
scooter. Raphael blames it on Felix's weirdness and they leave on the scooter to reach the school
where Raphael will be talking to some fans, but things just keep getting weird: a random teacher
calls him "Raph" as if she knew him, and Felix leaves him in the classroom alone. When Raphael
approaches the kids in class, he lets them ask any question they want, but they only have comments
about their homework. Raphael is starting to think this may be a prank by the journalists,
and after checking a mirror for hidden cameras, he decides to leave because he isn't in the mood for
this. Next he goes to his publishing company for a meeting about the movie adaptation of his book,
but nobody recognizes him there. Raphael thinks they're pranking him too and begins losing his
temper, so he's kicked out of the building. As soon as he hits the streets, Raphael is shocked
to see a sign on a bus promoting Olivia's next concert in one of the most important theatres
in the city. Raphael goes to that theatre to see what's going on and finds a group of fans waiting
for Olivia to come out, apparently she's this big piano star and as far as her fans and journalists
everyone knows, she's still single. When Olivia finally shows up, she signs autographs for
everyone and asks Raphael his name to give him one too, because she clearly doesn't recognize
him. Still utterly confused, Raphael returns to his apartment and finally notices everything is
different. Olivia's belongings aren't there, and there's nothing fancy about it either.
Raphael's notebook shows his story isn't complete, and googling himself doesn't produce any results
about fame. He does find his profile on social media and dating sites, which show him he works
as a literature teacher. Googling Olivia does give him better results: she's indeed a very successful
star and everyone is crazy about her. His search is suddenly interrupted by a videocall from Felix,
who wants to chat about the crazy party they went to last night, apparently partying and picking up
random women is something they do a lot. Before Raphael can question what exactly is going on,
someone rings the bell: it's Melanie, the teacher he saw earlier. She enters the apartment as if
Raphael was supposed to be expecting her, she also brings food and a hunger for something hotter than
dinner. Raphael panics and hides in the bathroom to buy time, and when he decides to take a shower,
he notices he has a tattoo on his chest that wasn't there before - it says "ping" because Felix
has "pong" to mark them as a ping-pong team. The next morning, Raphael looks for Felix and tells
him the only explanation that he can think of: he's arrived in a parallel universe where he has
a totally different life. Felix obviously doesn't believe him, so Raphael has no choice but to teach
his class for the rest of the day. After work, Raphael tries to explain things to Felix again,
but he's still not taken seriously, thus he asks his friend to summarize his life for him while
pretending he has amnesia. Felix tells Raphael that he's a literature teacher, that his students
love his classes, that they still play ping-pong tournaments together, and they don't share a
place because Raphael likes to bring different girls over all the time. In Raphael's eyes,
this sucks because of how different things are, but he can't help wondering if Olivia's also
trapped. In the evening, Raphael sneaks into a fancy party at the theatre by pretending to
be a waiter. When he approaches Olivia, she asks him for some food, so he brings it to her and is
delighted to be called by his name. Unfortunately this is a false alarm: Olivia remembers him from
the signing the day before, not from another life. Raphael takes a shot and admits he's not a waiter,
he just wanted to have the honor to talk to her, which Olivia considers very sweet. But
before Raphael can say more, Olivia is called over for some work stuff. On the weekend,
Felix takes Raphael to a ping-pong competition. Raphael hasn't played since high school and is
an absolute disaster, causing them to lose the match. Ironically this is what finally convinces
Felix the parallel universe story is true since his Raphael is an excellent player. Then Felix
begins mentioning examples of time traveling and alternate universes in fiction and points
out there always is a conflict that initiates the transition, so Raphael begins telling him
all about the night of their argument. Considering they had never fought before, Raphael assumes the
argument triggered this craziness and to solve it he needs to make Olivia love him again. At
first he thinks it would be easy because he knows everything about Olivia, but then he realizes her
tastes may've changed in this life. Raphael starts by visiting Gabrielle on Sunday. Gabrielle swears
she recognizes him, but soon Raphael catches on and understands in this universe she has memory
trouble, so she's just playing along; she also still has her special ring. When Olivia arrives,
she's shocked to see a man without authorization bothering her grandmother, causing Raphael to
pretend he's volunteering to read for the elderly in the nursing home before leaving the room to
give them some privacy. Olivia considers calling the director to check if Raphael's story is true,
but she's shocked to hear Gabrielle remembering her name thus when she mentions she remembers
the guy too, Olivia takes it as proof the story's real. Once her visit is over, Olivia finds Raphael
outside pretending to read to another elderly man. He drops the book as soon as he sees Olivia so
he can walk with her and do some chitchatting, he also buys her what he believes to be her favorite
coffee and snack, but in this universe, she hates the type he chooses. At least they get to talk,
and Raphael learns Gabrielle has become obsessed with reading biographies. Raphael thinks Olivia,
being the star that she is, should have one about her life and offers to write it himself,
but Olivia isn't interested. For his next attempt, Raphael gets his best friend's help. Felix changes
his name and calls Olivia's agent while pretending to be Raphael's agent offering a big deal to write
Olivia's biography. The guy finds Felix to be hilarious and agrees for Raphael to meet
with Olivia to discuss the matter. Raphael gets very excited and the following night, he goes to
Olivia's apartment with her favorite flowers in hand - luckily this time he does nail Olivia's
taste. Sadly he soon gets his hopes shattered when he is introduced to Marc, who is both Olivia's
boyfriend and agent, because this is supposed to be a business meeting. Raphael wants to kill Felix
for the misunderstanding but for now he goes to the bathroom and calls him to ask him to come too
after lying to Olivia and Marc by telling them Felix was just a little late. Moments later,
the four of them are having a pleasant yet a bit awkward dinner, and Raphael has lots of trouble
stopping his jealousy from making him do faces every time Olivia and Marc are sweet with each
other. After dinner, Olivia goes to the garden to have some fresh air, and when Raphael joins her,
he discovers she's actually smoking in secret because Marc hates it. Olivia also confesses
that since she's so young, she feels like writing her biography already would be too pretentious,
so Raphael decides to respect her wishes and drop the subject for now. When Marc comes to tell them
desert is ready, Raphae doesn't tell him about the smoking, and Olivia is so impressed by all the
respect he's been showing that she decides maybe she should give the biography a chance after all.
The next day, Raphael and Olivia meet at a café to start the first interview for the biography.
Raphael only pretends to have brought questions and to take note of Olivia's answers because he
already knows all her childhood anecdotes, but he still has a great time because it's like relieving
their first dates. Hours later when they're leaving, Raphael sees Melanie approaching and
tells Olivia she's an ex he can't get rid of, so in order to help, Olivia tells Melanie that she's
dating Raphael now. The trick works and Melanie finally gives up on Raphael for good. When Raphael
explains he knew Melanie from school, the subject of education comes up and Olivia's surprised
to hear they used to go to the same high school during the same years because she doesn't remember
him at all. Hoping to recreate the magic of the night they met, Raphael takes Olivia to their
old school and tries to get her in the abandoned piano room, but the door is locked. Unwilling to
give up yet, Raphael tries to break the padlock with a fire extinguisher, and this gets them
in trouble with another teacher so just like it happened in their youth, the pair has to run away.
Not everything goes exactly the same though: when Raphael takes her to the bench outside,
it's taken by a vagabond. For their next biography meeting, Olivia takes Raphael to the places where
she won her first prizes and had her first shows. When they're done, Raphael tries to schedule their
next meeting, but Olivia tells him he'll have to wait because she's leaving for a few days to have
a little vacation near the coast. Raphael wonders if he could come with her, but Olivia turns him
down, explaining she does this every year to have some alone time. The following day, Raphael is
delighted to get a text from Olivia saying she's changed her mind and that he can come, thus they
take the train together. The vacation house she's renting turns out to be the place where they had
their honeymoon in the other universe, so Raphael can't stop seeing flashbacks of his other life in
every corner. They have a lot of fun together while relaxing through various activities like
riding bicycles and playing the piano, although Raphael is going through constant whiplash between
present and past: this Olivia is sharing some childhood anecdotes he never knew about, but
she also keeps playing the same song she played the night they met in the other universe. During
dinner, Raphael feels brave enough to tell her the truth, but Olivia thinks he's pulling some kind of
writer's joke. After laughing, she makes up her own little story of a parallel version of them,
where they fight and cheat but in the end they mature and come together again. Once dinner is
over, they decide to go skinny-dipping in the sea, and Olivia allows herself to forget about
Marc for a night to get frisky with Raphael. The next morning, Raphael wakes up alone,
but there's a breakfast in a cute shape waiting for him. For a moment he thinks he's managed to
fix reality, but then he notices the tattoo is still on his chest, meaning he's still in the
parallel universe. Olivia is outside talking to Marc because of an emergency: Gabrielle has fallen
and now Olivia must cut her vacation short. After she hangs up, she asks Raphael to keep last night
a secret. With a broken heart, Raphael agrees, and when they take the train back, he has to
watch how Marc picks up Olivia at the station as if nothing happened. Instead of going home,
Raphael goes to see Felix to have a friendly ear to rant to. Olivia likes him again yet she chose
Marc and Raphael keeps complaining because he has to go back to teaching and stupid ping-pong. This
makes Felix finally snap, because he's tired of hearing Raphael insult the life he's built here,
not to mention that at least he has Olivia as a friend. Felix doesn't even have that: in this
universe, Morgane told him to leave her alone years ago and Felix respected that, so since then
he's been putting all his feelings into letters he never sent. If Raphael won't appreciate having
Felix and Olivia in his life, then Felix wants him out of his house. Not knowing what else to do now,
Raphael pays Gabrielle a visit, only to discover she doesn't have her ring anymore. This can only
mean one thing, so Raphael immediately calls Olivia, but she ignores his calls because she's
currently being proposed to by Marc. She does see Raphael's name on the phone screen though,
and that makes her hesitate before answering. Some hours later, Olivia and Raphael meet at
the bench outside school, and Raphael notices the ring on Olivia's finger. She explains Marc
has been with her a long time and wishes she had met Raphael earlier, and after she leaves,
Raphael cries his heart out on the bench while pretending the carving is still there, he also
goes to a bar to get drunk. Afterward, Raphael tries to accept this is his life now and works
to get used to the school routine. Felix isn't talking to him, so as the last gesture in the name
of friendship, Raphael takes all his letters to Morgane. One morning, Raphael's students discuss
that the writer of a book is that world's god, so if they want someone to die, then they just die.
This makes Raphael realizes something: it hadn't been the fight that triggered this universe jump,
it had been him killing his own wife in his story. After retrieving his old notebook,
Raphael begins working hard on his book again, but this time the hero sacrifices himself in the
end to save his love interest. Once he's done, he prints it and takes it to the theatre on Olivia's
big night to ask for one last big favor: he wants her to read this story, and promises he'll never
bother her again. Olivia accepts after hearing him say how important it is and tells him he can take
Gabrielle's seat at the concert if he wants to watch it because her grandmother hasn't remembered
to come in years. They seal the deal with a handshake. When Raphael goes back to the streets,
he bumps into Felix and Morgane, who are together now thanks to Raphael's meddling. Felix couldn't
be happier and forgives Raphael for everything to show his gratitude. Inside the theatre,
Olivia begins reading the story and this makes it snow like in the other life, which Raphael
sees as a sign his plan is working. He rushes inside to watch the concert, unaware that the
moment Olivia left the book behind to play, it stopped snowing as well. The concert then begins
and Raphael can't believe what he's seeing. As memories of his years with Olivia flood his mind,
he realizes she's never played the piano with this much passion and skill, which means he's
been holding her back and she's obviously better without him. Crying, Raphael leaves the hall and
sneaks into the dressing room to retrieve his book and only leaves a note behind saying loving Olivia
is the most beautiful thing that's ever happened to him. When the concert is over, Olivia is hurt
and disappointed to see the reserved seat is empty, the only one waiting for her is
Marc's serious face. Outside the theatre, Raphael throws his book in the trash, wondering what to do
next. His thoughts are suddenly interrupted by Olivia, who has realized where her heart
truly lies and has come looking for him to kiss him, a sign that she's choosing him over Marc.