Kim Ah-joong as Kang Han-na / Jenny
Joo Jin-mo as Han Sang-jun
Ji Seo-yoon as Ammy
Kim Hyun-sook as Park Jung-min
The title of the movie itself represents the character of the lead woman, an overweight but has an amazing voice woman. She is Han-na, a ghost-singer for Ammy's performance in stage and the singer behind her album. Han-na is a simple girl that has a crush on their director Han Sang-jun. On the night of director Han's birthday Ammy with her witch mind bullied Han-na and tell everybody that she has a crush with the director . Because of the humiliation Han-na hurriedly went to the bathroom and cried, she heard the director telling Ammy that she shouldn't treat her that way because Han-na is her only way to be famous by using her voice and they must be kind to her so that she will not leave the company. Han-na's heart is broken and she almost lost her mind, she attempt to kill herself, while thinking of a way how to kill herself the phone ring, from one of her SEXMATE that happens to be a plastic surgeon. She decided to undergo 100% plastic surgery instead of killing herself for the people humiliated her. She went to the surgeon and asked him to do the operation right away at first the surgeon refuses to do it, so she threatened the surgeon that she will tell his wife about the call.
After the operation Han-na came back to her family and friends, her bestfriend Jung-min didn't recognize her. They helped each other to hide the true identity of Han-na and decided to create a new identity - Jenny, a korean-american from california ,claiming that she is all natural. Everything turns smooth and polish, she audition to be Ammy's ghost singer but the company give her own recording contract. She become famous and a threat to Ammys' career. One day Ammy received a call from director Han forcing her to get a ghost singer in order to continue the recordings before she lose her job. So she visited HAn-na's father who is in the hospital and accompanied him for the meantime as she is thinking on how to find Han-na. After spending time with Han-na's father and Jenny, Ammy eventually realized that Han-na and Jenny is only one and decided to get ready for a revenge.
For the meantime, Jenny and Director Han spending time for a date, when Jenny felt that the director is taking advantage and remembered what the surgeon told her, that if somebody touches her breast it can be easily identified as fake, so she offered a phone sex session with the director. After a long period of time for the session Jenny fell asleep, the director saw what Jenny had drawn in the glass and realized that he had seen it before and yes he found out that it was the exact drawing in a music sheet drawn by Han-na,and because of that he knew that Jenny is Han-na but he kept it only to himself.
Jenny's debut single "Maria" becomes a hit and the recording company holds a party to celebrate its release. On the day of the party however, Ammy brings Han-na's father in an attempt to blow her cover. Han-na's father tries to return Han-na's Barbie doll to her, which had always been Han-na's favorite childhood gift from him. Startled by the sudden appearance of her father and not knowing how to react in front of all the people, including Sang-jun, Han-na denies knowing her father and calls him a fan instead when Sang-jun asks her if the old man is her guest. As her father keeps insisting on giving her the doll, Sang-jun drags him away from Jenny and knocks him down onto the floor. Desperate to keep her true identity a secret, Han-na makes no move to help her father. It is Jung-min who finally helps him up, casts Jenny a furious look and leads Han-na's father away from the party.
After the party Han-na and Han are the only ones left in the room. Han told Han-na that he already knew her true identity and felt disappointed after what had happen in the party. He couldn't forgive Han-na for lying about her identity but still can do promotions about the concert. Han-na at this point felt heartbroken again and sorry for herself. She teared every posters and smashed the cd's and blamed herself for everything . As director Han's tries to comfort her she refused to and whisper "You broke my heart. Tissue paper cannot fix it."
The company boss found out the about the identity of HAn-na and Jenny and decided to cancel the concert. But director Han didn't follow the order and insisted to continue the concert not for the sake of the fans or the company but for Han-na, and implied that he had forgiven HAn-na and wanted to support all throughout her career. He already fired Ammy for what she did to Han-na.
At the concert Han-na can't start to sing. She tearfully tell everybody that Jenny is fake and show the picture of true identity as Han-na, the fat woman who sang backstage for Ammy and and lip sync every song she sang. She was sorry for abandoning her father and her bestfriend just to become famous and a well known artist. As the background music plays Han-na looked around and saw a positive feedback from the audience that she was forgiven by telling the truth .
At the end of the movie Han-na became famous with her true identity, She drops the stage name Jenny and re-releases a CD with her own name, Han-na, she gains a lot of fans and anti fans.
