Kang Han-na (Kim Ah-jung) is an overweight phone
sex employee and a secret vocalist for Ammy, a famous Korean pop singer who actually lip syncs as she cannot sing. Instead of
being famous for her own amazing vocal talent, Han-na hides behind Ammy's
performance stage and sings during Ammy's concerts, and records all of Ammy's
songs. One day, Ammy ungratefully humiliates her in front of the music company's
director Sang-jun (Ju Jin-mo) during his birthday party, knowing full well
that Han-na has a crush on him. While crying in the bathroom, Han-na overhears
Sang-jun telling Ammy that even though they are just using Han-na for her voice,
they must be kind to her so she will not walk out on them. Heartbroken, Han-na
contemplates suicide but is interrupted by a phone call from one of her phone
sex regulars who happens to be a top cosmetic surgeon. She decides to get a
head-to-toe makeover instead. The surgeon at first refuses to operate on Han-na,
but Han-na blackmails that she will tell the surgeon's wife about his calls.
Then, Han-na makes a moving speech that she does not want to undergo
surgery merely to be beautiful, but for the sake of love and as a boost in
confidence, and the surgeon is deeply moved. Han-na putsherself in
seclusion for a year as she recovers from the changes.
When she comes back from the hospital, Han-na is incredibly beautiful and slender.
No one, not even her best friend, recognizes her. With the help of her best
friend, she creates a new identity for herself; she is now Korean-American from
California named Jenny. After auditioning to be Ammy's secret vocalist
again, she earns her own recording contract instead from Sang-jun, claiming that
she is "all-natural". In the meantime, Ammy, oblivious just like everyone else
of Han-na's new identity, desperately tries to find Han-na so that she can
record her own postponed album (since she cannot sing the songs herself) by
spending time with Hanna's father who is in a hospital with some mental
problems, possibly Alzheimer's. Through spending time with Han-na's
father, she eventually realizes that this new Jenny is actually Han-na in
disguise. So on the day of a party, Ammy brings "Jenny's" father, who tries to
return Han-na's Barbie doll to her, which has always been Han-na's
favourite childhood gift from him. Startled by the sudden appearance of her
father, Hanna knocks him down, and Hanna's friend helps him back up.
Romance
then begins to blossom between "Jenny" and Sang-Jun. However, after a date one
night, when Han-na is asleep, Sang-jun wakes up and happens to look at a
glass panel on which Han-na has drawn a Hakuna Matata sign. He remembers
that when Han-na still existed and he had not met "Jenny" yet, Han-na had drawn
the exact same signs on a sheet of music. Then he adds all of the signs up and
realizes as well that Han-na is actually Jenny, and he seems to be unable to
forgive her for lying to him, though Han-na still tells him that she will
continue working and will succeed as an artist.
The day of "Jenny's" first
concert, Ammy reveals to the public that Jenny is a "fake," and that she is not
"all-natural", as she had claimed, but is "plastic". However, nobody seems to
believe her. During the concert, Han-na breaks down and tells the large crowd
her story: that she has abandoned everything and her best friend and father to
get to where she is, and that she is not naturally beautiful. The screens
behind her on stage then show a clip of the old, obese Han-na, singing
angelically. The crowd responds by chanting "It's all right," and Han-na
rekindles her relationships with her father and best friend. She drops the stage
name "Jenny" and re-releases a CD with her own name, Hanna, and becomes a highly
successful music artist, gaining many anti-fans as well as loyal fans along the
way. Sang-jun realizes the very thing about Han-na that had always drawn
her to him - Han-na's innocence.