Lee Jang-Hyeok is rushed to the hospital, and cared for by a pretty nurse, named Da-Eun.
A weakened Hyeok tells her, that he got seriously sick, after working hard on passing a test
for a major engineering job.
Hyeok not only passed the test, but also got the job.
Da-Eun assures him that he will be alright.
Hyeok is suffering from Hepatitis B, and other patients around him start to believe, that
it might be contagious.
Hyeok's parents come to see their sick child, but they also start to wonder, if Hyeok's
disease is contagious.
They avoid any physical contact with Hyeok.
Soon, Hyeok gets messages from his close friends.
They will not be coming to see him, as they don't want to get this disease themselves.
Da-Eun lets every other patient know that hepatitis isn't contagious, and Hyeok would
be perfectly normal after some days.
She is extremely nice to Hyeok, and she even kisses his IV bag, so that Hyeok can be relieved
of all the stress on him.
Hyeok goes for a walk at night, and finds Da-Eun in the hallway, smoking a cigarette.
Da-Eun tells Hyeok, that she isn't allowed to smoke in front of the head nurse.
Da-Eun also rants about how she has to work an eight-hour shift, every single day.
Hyeok notices a ring on Da-Eun's finger, to which Da-Eun says it's her graduation ring.
Soon, the head nurse arrives, and Da-Eun blames the smoking on Hyeok, to avoid getting herself
in trouble.
The following day, Da-Eun apologizes to Hyeok, for putting the entire blame on him, as Da-Eun
would have got a pay cut for smoking.
Hyeok, who is eating a delicious meal at the moment, watches how Da-eun starts eating Hyeok's
food, without his permission.
Hyeok doesn't seem to mind it at all.
Da-eun promises to buy him food later.
One night, Da-eun gets so tired, that she decides to take a power nap on Hyeok's bed.
Hyeok starts to become attracted to Da-Eun, and even shares it with his friends.
Hyeok can't get over the fact, that a cute girl like Da-eun is enjoying his presence.
Da-eun catches Hyeok smoking in the hallway, and Da-eun doesn't take it lightly, as Hyeok
is still sick with hepatitis.
Hyeok leaves a message on his phone for her, in which he swears never to smoke again.
Soon, Hyeok begins to call Da-eun to meet him.
Thinking that it would be a patient call, but most of the time, Hyeok calls her to read
messages he leaves for her, along with something for her to eat.
Hyeok would leave oranges for Da-eun, if she happens to be working overnight, or soup if
she's tired from working during the day.
But for the most part, Hyeok calls Da-eun, so that she can take a nap whenever she feels
burnt out.
Hyeok even steals expensive macarons from another patient's fridge, and gifts them to
Da-Eun.
While having lunch together, Da-eun inquires if Hyeok has a girlfriend, to which Hyeok
freaks out, and says he doesn't.
When told by other doctors, that he would be discharged in a day or two, Hyeok begins
to panic, as he doesn't want to leave Da-eun just yet.
He also gets jealous, when he sees Da-eun talking to one of her colleagues very closely.
Before he can part ways with Da-eun, Hyeok plans on giving flowers to Da-eun, but the
entire plan goes awry, when the head nurse shows up upon calling Da-Eun.
Hyeok is not at all happy to leave the hospital, without saying a proper goodbye to Da-eun,
or getting her number.
When he is with his friends, he eats uncooked meat hoping to get sick, and end up in the
hospital again.
Hyeok is bent on the thought, that Da-eun might be in love with him.
Hyeok visits the hospital, with the plan of getting Da-eun's number.
Just when he can properly memorize her number, the head nurse arrives, and Hyeok has to leave
immediately.
Hyeok goes back home, and tries to remember Da-eun's number.
After trying various combinations, with the half number he learned, Hyeok is finally able
to make a call to Da-Eun.
Hyeok spares no time in acknowledging his likeness for Da-Eun.
Da-eun invites Hyeok to her home, as she is completely alone.
Hyeok takes his father's car, and rushes to Da-eun's apartment.
Hyeok's father gets furious at Hyeok, for taking his car without his permission.
Hyeok arrives at Da-eun's apartment, and is shy in front of her.
Hyeok is nervous to start a conversation.
As he gets a bit more uneasy, Hyeok decides to leave, but Da-eun proposes that he should
sleep alongside her, for the night.
Hyeok does as asked, and both have a good night's sleep.
The next morning, Hyeok fixes a broken light bulb, takes out the trash, and even prepares
breakfast.
Da-eun is moved by Hyeok's efforts to prove, that he actually has feelings for her.
Da-eun briefly makes out with Hyeok.
For the next couple of days, Hyeok assists Da-eun in her work, and enjoys his new life,
although his parents have yet to believe, that he is in a relationship.
Hyeok is sometimes envious of Da-eun's colleague, who happens to be around her.
Upon asking where her ring is, Da-eun tells Hyeok, that she lost it.
Da-eun has received a vacation package to Jeju Island, and she wants Hyeok to go with
her.
Hyeok and Da-eun go to get matching shirts for each other, but are unable to complete
the purchase, as Hyeok can't find the right size for himself.
Hyeok arrives at the airport for their flight to Jeju Island, and much to his surprise,
Da-eun gifts Hyeok sneakers, that match hers.
Hyeok is elated, and he promises to lose weight for their next trip to Jeju Island, next Christmas.
Hyeok makes good on his promise, and loses much of his weight.
Hyeok is in a phenomenal physique, and looks better than ever.
Hyeok and Da-eun are enjoying their life as usual, and Hyeok seems to be doing good in
his job as well.
Hyeok is informed by his boss, that he has been called up to a much larger corporation
in Seoul.
Although he is hesitant to leave Da-eun, and his city, Hyeok can't also give up on this
huge offer, as he believes that it may be good for his career and Da-Eun.
Hyeok informs Da-eun that he can't give up on this offer, as it is an amazing opportunity
for both of them.
Da-eun is skeptical of Hyeok, as she believes that this was something Hyeok should have
discussed with her, before saying yes.
Hyeok surprises Da-eun with his brand-new car.
He says he was fed up with borrowing his father's car every time, so he decided to get his own.
But the main reason Hyeok has bought a new car is, that he plans on commuting to Seoul
and returning to his and Da-eun's apartment, every single day, as he doesn't want to live
without Da-Eun.
Hyeok also gifts Da-eun a new ring, as she lost her old one.
Hyeok prepares to leave for Seoul, and while he's on his way, Hyeok watches other people,
who are tired of going to work every single day.
Hyeok mocks them, as he can't believe how people could be tired of working that much.
When Hyeok reaches his new office, he asks one of the workers, where he is supposed to
go.
The mysterious employee shows Hyeok the way to his office.
Hyeok introduces himself to his new bosses, and is also introduced to Bo-Yeong, who would
be competing against Hyeok for the permanent job position.
Hyeok is livid as he was told by his former boss, that he would be the only one who would
be getting the job.
He calls his previous boss, who tells Hyeok that he would have to work harder now, in
order to prove his worth to the company.
Hyeok finds Bo-Yeong to be competitive, and starts thinking of ways how he could finalize
his permanent position.
Da-eun advises Hyeok, that he should do something that would make the bosses appreciate Hyeok
more.
Hyeok comes up with the idea of buying everyone coffee in the office, but Bo-Yeong comes in
his way, and decides to distribute the coffee to every employee, even when Hyeok doesn't
ask for her help.
And because of this, Bo-Yeong gets complete credit for it.
The entire team in the company is working on creating a design for a new bridge.
Bo-Yeong tries everything to mislead Hyeok, and Hyeok even falls for it, which leads to
him getting scolded by his boss.
Hyeok is getting frustrated by Bo-Yeong, and Da-eun advises him to one-up on Bo-Yeong the
next time she decides to get clever.
The time has come for the presentation of the new bridge's design.
At first, the entire team is applauded for creating a strong design, but Hyeok interferes
the celebration, and says that the bridge might collapse if a tsunami ever hits it.
When the tests are run, Hyeok is proven to be right.
Hyeok is happy, as he is able to make Bo-Yeong look a little less impressive.
The head of the company decides to pair up the new employees, Bo-Yeong and Hyeok, to
recreate the design of the bridge, so that the company could know their true capabilities.
Hyeok tries his best to tease Bo-Yeong even more, and he is able to gain the upper hand
every time.
Hyeok hasn't been paying much attention to his work, while Bo-Yeong is working extremely
hard, to the point where she refuses to freshen up with some sleep or a bath.
Hyeok goes back to his apartment, and can't wait to tell Da-Eun how he was able to make
Bo-Yeong look bad in front of the executives.
Before he can do so, Hyeok falls asleep, as he is tired of the long commute from his office
to the apartment.
Hyeok is on his way back to his office the next day, and he notices that his life is
becoming just like other people, who he used to mock for overworking themselves.
Da-eun proposes that Hyeok doesn't have to come back to the apartment every single day,
as he can come back on the weekends from now on.
Bo-Yeong is exhausted from recreating the bridge's design, and she hasn't taken a day
off ever since she was paired with Hyeok.
They are working late night, when the light goes out.
Hyeok tries to find someone who could resolve the problem.
He runs into the mysterious employee he met on the very first day.
The employee alludes to a worn-out Bo-Yeong, when he advises Hyeok to take advantage of
every opportunity that's in front of him.
Hyeok tells Bo-Yeong that he is leaving for home, to which Bo-Yeong begins to yell at
Hyeok that she has been doing all of the work by herself, and Hyeok hasn't helped even once.
Hyeok feels bad for Bo-Yeong, and thinks that he might have gone a bit overboard, when it
comes to making Bo-Yeong's work miserable.
Hyeok helps Bo-Yeong in recreating the design of the bridge, and both of them are able to
create a design that can withstand a tsunami.
The bosses applaud the efforts of both, and the company looks forward to having them work
on further new projects.
During the company dinner, Hyeok hopes to leave early, so that he can meet Da-eun, while
Bo-Yeong drinks way too much alcohol.
Hyeok returns back to his apartment, and is tired as usual from the long travel.
He doesn't find Da-eun in the apartment, but later learns from her that her shift was changed,
which is why she had to work at night.
She also asks Hyeok to change the broken light bulb, but Hyeok is unable to do so as he is
extremely fatigued.
The next morning at work, the boss appreciates Bo-Yeong and Hyeok even more.
He hypes them up, and tells them to keep up the good work.
Bo-Yeong confesses that she enjoys working with Hyeok, to which Hyeok adds that he feels
the same about her.
For the next couple of days, both Hyeok and Bo-Yeong work together on a new project, closely
with each other.
Both of them are enjoying each other's company, but at the same time, Da-eun is being completely
ignored by Hyeok.
The employee that has been following Hyeok ever since he arrived at this company, constantly
tells him to make a move toward Bo-Yeong.
Bo-Yeong seems to have taken a liking to Hyeok.
The next project turns out to be even more successful than the last one, and the company
executives are happy to have both of them around.
Bo-Yeong proposes that they should go for dinner together that night, which Hyeok is
absolutely fine with.
While they are having a delicious meal, Da-eun calls Hyeok to check in on him.
As he can't say he is having dinner with Bo-Yeong alone, Hyeok lies to her that he is with the
entire company at a restaurant.
Da-eun returns home to find that Hyeok hasn't fixed the light bulb she asked him to.
While they are working on a brand-new project, the light goes out once again, and Bo-Yeong
seems to make a romantic advance toward Hyeok.
The employee that has been stalking Hyeok, and wants Hyeok to do the same.
As he is completely committed to Da-eun, Hyeok leaves abruptly.
Hyeok returns home, and finds Da-eun in a frustrated mood.
She is upset that Hyeok didn't change the light bulb, and that Hyeok always comes home
to relax, rather than meet her.
Hyeok says that he doesn't want to talk at the moment, as he needs some rest, but much
to his shock, Hyeok learns that Da-eun is expecting a child.
Hyeok worries for Da-Eun and their future, as he wasn't expecting to have children this
soon.
Da-eun visits a doctor, and she finds out that she is indeed pregnant.
Hyeok doesn't seem to be too excited over this news, and because of this, he doesn't
pay much attention to his work at the office.
Hyeok and Da-eun visit a medical clinic, and both of them make a heart-wrenching decision.
Hyeok appears to be completely senseless, but Da-eun keeps her spirits up, although
she is deeply affected by this situation.
Hyeok has decided to take some time off from the office, so that he can focus on Da-eun's
health.
Da-eun urges him to go to work, as she doesn't need him around.
Hyeok follows her commands, and heads back to work.
Hyeok works till night, and he hopes to get back to Da-eun as soon as possible, even though
the routine of him getting tired by the time he reaches home is the same.
Upon asking if he is still interested in going to Jeju Island on Christmas, Hyeok doesn't
give a satisfactory answer.
Hyeok is getting annoyed by how he has to travel to work on a routine basis, which has
been affecting both his work and relationship with Da-Eun.
Bo-Yeong seems to be upset with Hyeok, as they were performing quite well over the last
few months.
Hyeok decides to focus on his work, by staying in Seoul a little longer.
Soon, both Bo-Yeong and Hyeok regain their charm as a strong pair.
While they are shopping, Hyeok completely avoids Da-Eun, and doesn't show even the slightest
enthusiasm.
Before they can drive off to get something to eat, Da-eun is distraught over the fact
that Hyeok has been completely sidestepping her.
Hyeok tries to cheer her up, but makes a terrible mistake by calling her Bo-Yeong instead of
her actual name.
This puts Da-eun in serious doubt that Hyeok might be having an affair with Bo-Yeong.
Upon asking who Bo-Yeong really is, Hyeok asks Da-eun if she suspects that Hyeok might
be having an affair with Bo-Yeong behind her back.
Da-eun cries that both of them had to give up on their child only for Hyeok to go after
another woman.
Hyeok doesn't want to explain or defend himself, so he decides to leave for Seoul early.
Hyeok returns to his work, and when Bo-Yeong tries to get a little close to him, both of
them share a romantic kiss.
This leads to a much more serious relationship between the two, with Hyeok having to shift
his priorities from Da-eun to Bo-Yeong from now on.
Hyeok begins to get reminder messages about the tickets he reserved for Jeju Island, but
he doesn't know what to do with them, as he hasn't been in contact with Da-eun for sometime
now.
The day finally arrives when Bo-Yeong and Hyeok would find out if their jobs have been
made permanent or not.
It turns out, that the existing permanent employees of the company have been credited
with the work of Bo-Yeong and Hyeok.
None of them has got a full-time permanent job offer.
Hyeok is heartbroken that he didn't get the job, and has almost lost Da-Eun.
Bo-Yeong says that she's considering going abroad for further studies.
Hyeok suddenly remembers his tickets to Jeju Island, and decides to fix his relationship
with Da-Eun.
He grabs the ring that he once gifted to Da-Eun, and rushes to the airport.
When he watches Da-eun, he runs towards him, but bumps into another man and falls down.
It turns out that there were two Jang-Hyeoks who were with Da-Eun.
One of them was the overweight person, Lee Jang-Hyeok, whom Da-eun tended to at the hospital
and the other one was Jang-Hyeok, who was in a serious relationship with Da-Eun.
Da-eun fell in love with Jang-Hyeok at the hospital just like Lee.
Da-eun got pregnant when she was with Lee at the hospital, which explains her sudden
cravings for food and sudden tiredness.
After giving up on her baby, Da-eun decided to have a relationship with Lee.
She later on, gave the tickets to Jeju Island to Lee as it was easy, because he shared the
same name as Jang-Hyeok.
Jang-Hyeok is numb over the betrayal of Da-Eun, and he returns to Bo-Yeong where he tries
to think of the exact moment when his relationship with Da-eun went completely off the trail.
Bo-Yeong has won the tickets to Jeju Island as well, and Jang-Hyeok proposes to Bo-Yeong
who leaves him too, saying that they aren't there yet.