A Werewolf Boy begins by showing a Korean family living in the US enjoying their breakfast.
Not long after, the grandmother named Kim Sun-yi, got a call from someone in South Korea
who said that there was something important, which required her to return to South Korea
as soon as possible.
Sun-yi finally rushed back to South Korea.
Upon arrival at the airport, Sun-yi is picked up by her granddaughter, Eun-joo, who immediately
takes her to her old family home located in the countryside.
When they finally get there, Sun-yi looks flabbergasted because things haven't changed
much since the last time she left the house.
But on the other hand, Eun-joo shudders at the sight of her ancestral home, which she
finds very haunted and has an eerie aura.
But then, Sun-yi is reminded of her past, precisely in 1965, when she first moved into
the house with her widowed mother and her younger sister, Sun-ja.
Neighbours flocked to help Sun-yi's family bring furniture and other items into the house.
Even though most of their neighbours are elderly, they are enthusiastic and selflessly help
her family who recently moved to the village.
However, this was not the case with a young man of good-looking appearance who just looked
around and talked a lot, without helping them in the slightest.
After that, Sun-yi's mother made dinner and invited the neighbours to eat with them as
a form of gratitude for helping her family.
While eating, the neighbours asked several questions about their family, including the
whereabouts of the family, as well as the reason why they had all moved to the remote
village.
Sun-yi's mother explained that her husband had died two years ago, and they moved to
the village because Sun-yi had to undergo a period of recovery after suffering problems
with her lungs.
The neighbours then inquire about a young, elegant-looking man who doesn't help Sun-yi's
family at all with moving things.
Sun-yi's mother then informs that the young man is Ji-tae, their landlord who bought this
house and allowed them to live here.
On the other hand, Sun-yi chooses not to touch her dinner and returns to her room, as she
feels uncomfortable with the neighbours in her house.
In the middle of the night, Sun-yi suddenly wakes up to a sound coming from her bedroom
window.
She is frightened, then rushes to her sister's room and wakes her up.
But Sun-ja is reluctant to open her eyes and chooses to ignore Sun-yi.
Out of curiosity, Sun-yi sneaks out of the house secretly and looks for the source of
the sound, which turns out to be from an old warehouse behind the house.
She ventured into the old warehouse and suddenly screamed as loudly as she saw something.
The next day, neighbours visited and asked about the screams they had heard last night.
Although Sun-yi's mother did not explain it in detail, they then warned her family to
be careful because wolves often roam around the village and often enter residential areas.
Sun-yi's then thanked the neighbours for being so considerate of their family.
On the other hand, Sun-yi who is drying clothes in the yard accidentally sees a mysterious
figure who seems to be watching her from the direction of the old warehouse.
She rushed to call her mother and showed her what she saw.
Her mother then threw boiled potatoes toward it, and the mysterious figure finally revealed
its true form: a feral young man who can neither read nor speak and behaves like a wild beast.
The young man then devoured all the boiled potatoes that Sun-yi's mother had given him
until nothing was left.
Sun-yi looked at the young man with disdain for his dirty and smelly appearance.
Sun-yi's mother then takes the feral young man to the social service office, hoping to
find his family.
However, the young man was not registered in any family, so Sun-yi's mother assumed
that the young man was an orphan whose family died due to the Korean war.
Having no other choice, Sun-yi's mother then decided to take the young man back to her
home and take care of him while waiting for the orphanage staff to come to take him.
Arriving home, Sun-yi's mother attentively helps the young man take a shower and put
on clean clothes, because it turns out that he can't do basic things like bathing and
eat properly.
Sun-yi was then disgusted by the young man's behaviour and scolded her mother for willing
to take care of him, even if only for a few days.
Having lost her appetite, Sun-yi chose to go to her room and afterwards, reluctant to
eat with her family while the young man was at home.
The following day, her mother and Sun-ja have to go somewhere, so Sun-yi is alone at home
with the feral young man.
Feeling bored, Sun-yi then decides to look for reading books in a cardboard box that
she hasn't finished yet.
However, she found it difficult to lift the box because it was too heavy.
The young man had apparently been observing what Sun-yi was doing earlier and intended
to help her.
But Sun-yi gets the wrong idea and thinks the savage young man is about to attack her.
After knowing his real intention, Sun-yi then gave him boiled corn as a form of gratitude
because he had helped her.
Not long after, Ji-tae comes to the house and tells Sun-yi that she shouldn't bother
studying or working because she will eventually marry him.
Sun-yi then flatly refuses Ji-tae's offer to marry him, then bully him.
However, Ji-tae gets even more violent by grabbing Sun-yi's wrist and pulling her closer
to him.
Seeing Sun-yi being threatened, the young man approached Ji-tae and squeezed his wrist.
Ji-tae is afraid to face the feral young man, then chooses to back off and rushes to leave
the house.
Since that incident, Sun-yi finally realized that the wild young man might be a good person.
The next day, Sun-yi boils a lot of potatoes and asks her mother where the wild young man
is.
Her mother then tells Sun-yi that the wild young man, now named Chul-soo, was playing
with Sun-ja and her friends in a meadow not far from their house.
Sun-yi rushes after them with boiled potatoes for Chul-soo.
Sun-yi then teaches Chul-soo proper eating and asks him to do as she says.
Because Chul-soo can understand her words and is a fast learner, Sun-yi also appreciates
him by stroking his head tenderly.
When they were about to have lunch together, Sun-yi's family looked surprised that Sun-yi
had eaten with them, whereas before that she had always refused to eat together if Chul-soo
was there.
However, Sun-yi casually ate the food and told Chul-soo to do as they had previously
learned.
Sun-yi's mother, who saw this, seemed surprised because now Sun-yi could accept Chul-soo's
presence in their house, even she taught him to eat properly.
After that, Sun-yi taught Chul-soo many things, such as brushing his teeth, folding mattresses
and blankets, and tying his shoelaces.
If Chul-soo manages to do everything as she is taught, then Sun-yi will gently stroke
his head.
The next day, Sun-yi cuts Chul-soo's hair and straightens it.
After that they go to the market with Sun-yi's mother and Sun-ja.
When Sun-yi and her family were busy shopping for clothes, suddenly Chul-soo was no longer
behind them and disappeared somewhere.
Not long after, they finally found Chul-soo in front of a food vendor because he seemed
to want to eat the food.
However, unbeknownst to them, from the roof of a building above them, several people were
seen trying to move iron bars.
However, a piece of iron suddenly fell and would fall on Sun-yi and her family if Chul-soo
didn't protect them soon.
Everyone was stunned when they saw with their own eyes that Chul-soo was completely unharmed
after a wide flange beam hit him.
Sun-yi's mother then takes Chul-soo to several doctors and health specialists to check his
condition.
But he was not injured at all.
In the evening, Ji-tae, who is a little drunk, is seen driving a car on a country street.
Jin-tae, who was with a woman at the time, drove at such high speed that he couldn't
control his car and ended up crashing into the door of a goat barn on a farm.
A goat died in the incident, and the herd fled the pen because the door was broken.
On the other hand, Chul-soo apparently witnessed the incident and then took the dead goat and
handed it over to the owner of the farm, Mr. Jung.
The next day, Sun-yi teaches Chul-soo to read and write and teaches the correct pronunciation
of words in everyday conversation.
After that, Sun-yi played her guitar while singing a song.
Chul-soo was flabbergasted by Sun-yi's melodious voice, then stroked her head gently after
she finished her singing.
Immediately, Sun-yi became embarrassed in front of Chul-soo.
That night, a drunk Ji-tae bangs on the door because he's lost the key.
Sun-yi opens the door, and then asks Ji-tae why he came there at night while Chul-soo
watches them from a distance.
Ji-tae then invites Sun-yi to go out with him and his friends.
When Sun-yi refuses, Ji-tae violently drags her out and pushes her to the ground.
Seeing Sun-yi being hurt like that, Chul-soo did not stay silent.
He then growls, suddenly turning into a werewolf who attacks Ji-tae and his friends.
When Chul-soo was about to kill Ji-tae, Sun-yi then ordered him to stop.
Despite being a werewolf, Chul-soo doesn't lose consciousness and responds to Sun-yi's
words.
Chul-soo then lets Ji-tae and his friends leave, and then transforms back into his fully
human form.
After that, Ji-tae immediately reported the incident to the police station, so that night,
the police came to Sun-yi's house to investigate.
Ji-tae tells the police that he and his friends saw Chul-soo turning into a werewolf.
However, Sun-yi, still in shock and fear, cannot confirm their statement.
Ji-tae also looks irritated that Sun-yi is silent as if to cover up the fact that Chul-soo
is a werewolf.
Sun-yi and Ji-tae instead get into an argument, in which Sun-yi regards Ji-tae as a con artist
who has deliberately plunged her family into poverty.
Ji-tae, who doesn't accept the accusation, then slams things in there, including destroying
Sun-yi's guitar.
Although Sun-yi did not testify about Chul-soo being a werewolf, in the end the police decided
to lock Chul-soo in an old warehouse and install CCTV cameras to monitor him.
One day, Sun-yi walks into Chul-soo's room and gives him a book of fairy tales, at which
point she asks Chul-soo to study reading diligently.
Sun-yi says that one day, she wants to hear Chul-soo read the tale to her fluently.
Sun-yi then takes Chul-soo to the meadow for fresh air, where they run happily.
But then, Sun-yi suddenly feels short of breath and collapses unconscious.
Knowing that Sun-yi is sick, Chul-soo rushes to take her home.
However, he didn't find anyone there.
A panicked Chul-soo then takes Sun-yi to Mr. Jung, who is the closest neighbour of the
Sun-yi family.
But the house was empty because all the occupants were away.
Since Chul-soo doesn't know where else to go, he takes Sun-yi into the forest.
That night, Sun-yi's mother, who couldn't find Chul-soo and her daughter, then asked
neighbours and the police for help to find them both in the forest.
After searching for a long time, they finally found Sun-yi and Chul-soo.
After that incident, Chul-soo was locked up and chained so as not to escape.
They then discuss what action they will take if Chul-soo runs or harms someone, which is
why they will most likely not hesitate to kill him.
However, as long as they monitor Chul-soo through CCTV cameras, he shows absolutely
no suspicious activity, where Chul-soo only seems to be learning to write and read, as
Sun-yi always taught him.
The police then decide that Chul-soo might be released soon and re-mingle with society
if he continues to behave well and not cause harm.
However, Ji-tae is unhappy about it and then brings up the fake news about Chul-soo having
killed Mr. Jung's goat.
To support his statement, Ji-tae presented an eyewitness, namely a woman who had accompanied
him and Mr. Jung.
Nevertheless, Mr. Jung doesn't fully agree with Ji-tae's words because Chul-soo handed
the dead goat in one piece, unlike Ji-tae's saying that Chul-soo tore up the goat like
a hungry wolf.
To convince everyone, Ji-tae then executes a plan to frame Chul-soo.
He quietly turns off the electricity in the house and then beats the police officers on
guard until they pass out.
After that, Ji-tae quietly opens the door to the room where Chul-soo is locked up, telling
him that Sun-yi hates him so much.
Ji-tae then tells Chul-soo to find Sun-yi's guitar at her neighbours' house, saying that
Sun-yi will forgive him if he manages to get the guitar.
Knowing that Sun-yi really likes the guitar, Chul-soo follows Ji-tae's words and leaves
immediately.
Once the power comes back on, the police look surprised that Chul-soo has already escaped
from where he was locked up.
They also rush to search around the house to find Chul-soo's whereabouts.
Elsewhere, Chul-soo came and ransacked Mr. Jung's house to look for Sun-yi's guitar.
Not finding it there, Chul-soo then goes to a woman's house not far away.
Chul-soo's arrival causes the woman to scream loudly, so the police immediately know where
Chul-soo is.
When the police surround Chul-soo, Sun-yi tells them that she will try to persuade Chul-soo
not to fight back.
She then approached him slowly, and asked him to take her hand.
However, Ji-tae points a gun instead and threatens to kill Sun-yi if she gets in his way of killing
Chul-soo.
Ignoring Ji-tae's threat, Sun-yi steps forward to protect Chul-soo.
However, Sun-yi accidentally falls to the ground, where Ji-tae then kicks her while
insulting her.
Chul-soo who saw Sun-yi being hurt like that, did not stay silent and immediately turned
into a werewolf, surprising everyone present.
Chul-soo then attacks Ji-tae, killing him.
After that, Chul-soo took Sun-yi away into the forest.
The next day, Sun-yi wakes up from her sleep and finds Chul-soo transformed back into his
human form.
Because of what happened last night, the police and all the villagers are looking for Sun-yi
and Chul-soo, where Sun-yi is very sure that Chul-soo will be executed by them for attacking
right in front of them.
To save Chul-soo who risked his life to be with her, Sun-yi tells him not to follow her.
Even she says that she hates him, only for Chul-soo to leave her and go as far as possible
before they find him and execute him.
For the first time, Chul-soo says something to Sun-yi, who asks her not to leave him.
However, for Chul-soo's safety, Sun-yi had to leave him.
Before leaving, Chul-soo tells Sun-yi to wait for him, and he promises to come back to see
her.
After that incident, Sun-yi and her family decided to move abroad.
The scene then turns back to the present.
Sun-yi decides to spend the night at the house while reminiscing about the past.
That night, Sun-yi who can't sleep then goes to the old warehouse where Chul-soo used to
be locked up.
As she enters, Sun-yi sees the room where Chul-soo is emitting light from the gap in
the door.
She opens the door to the room and is surprised to find Chul-soo sitting there, still as young
as he was forty-seven years ago.
When Chul-soo handed over the note he had written, Sun-yi realized that he had been
waiting for her all along.
Chul-soo then gives Sun-yi a guitar that he had repaired and then fulfils his promise
to read her a fairy tale book that she asked him to read years ago.
When Chul-soo reads the book of fairy tales in his soft and soothing voice, Sun-yi finally
falls asleep there.
The next day, Sun-yi wakes up but finds Chul-soo nowhere.
She then leaves there with her granddaughter and decides not to sell the house because
she doesn't want to destroy her memories with Chul-soo.
On the other hand, Chul-soo watches Sun-yi leave from afar as the car drives further
and further.
The moral that can be learned from this movie is to stay loyal to the people who do good
to you because their kindness can make us good people too.