Who Are You School 2015 Cast and Characters

Ko Eun-byul and Lee Eun-bi (both played by Kim So-hyun) are identical twins, separated after one is adopted at the age of 5. Eun-bi lives at the Love House, an orphanage in Tongyeong, South Gyeongsang Province, where the younger residents look up to her as a mother figure. However, she hides the fact that she is bullied at school by a gang of mean girls led by Kang So-young, while teachers turn a blind eye.

On the other hand, Go Eun-byul is studying at Sekang High School, the most prestigious private high school in Seoul's Gangnam District. Eun-byul's best friend is Han Yi-an (Nam Joo-hyuk), the school's star swimmer.

However, only Eun-byul is aware of the other's existence. Unlike the cheerful Eun-bi, Eun-byul is prickly and secretive.

One day, on a school field trip to Tongyeong, Eun-byul mysteriously disappears. At the same time, Eun-bi is unjustly expelled from her school and jumps off a bridge in a suicide attempt. Ten days later, the injured and amnesiac Eun-bi is mistaken for her twin, Eun-byul, and her adoptive mother takes her home to Seoul, where she starts living as Eun-byul. However, her memory soon returns.

Eun-bi faces many challenges as Kang So-young transfers to Sekang High School and tries to reveal her real identity, as well as using her Dad's authority to make Eun-bi transfer from the school. Luckily, Gong Tae-kwang (Yook Sung-jae), Eun-bi's classmate and the school troublemaker, protects her whenever So-young tries to bully her. Eun-bi also stands up to So-young and disproves her claims about her identity, as well as ruining her plans to have her transferred. Eun-bi tells Tae-kwang her real identity, and he eventually begins to develop feelings for her but Eun-bi sees him only as a friend. At the same time Eun-bi has developed feelings for Han Yi An although she cannot confess it to him as she is living under the guise of Eun-byul and worried that she might lose Han Yi An if she tells the truth. Han Yi An grasps the truth in his heart but not yet ready to face it. Eventually they both find their way to each other after finding out their true selves and feelings.

Kim So-hyun as Lee Eun-bi (Go Eun-bi) / Go Eun-byul
Go Eun-byul and Lee Eun-bi are identical twins. Lee Eun-bi lives in an orphanage whereas Go Eun-byul, Eun-bi's twin sister lives with a woman who adopted her. Due to bullying, Eun-bi decided to end her life but she was saved by her twin sister. Eun-bi had amnesia after that. When Eun-byul's adoptive mother mistook Eun-bi as Eun-byul, she starts to assume the identity of her twin sister. She likes Han Yi An and confesses her love to him in the end.

Kang Ji-woo as young Lee Eun-bi (Go Eun-bi) / Go Eun-byul

Yook Sung-jae as Gong Tae-kwang
Described by his father an idiotic and problematic child, Gong Tae-kwang is widely known as a troublemaker in school. His father is the director of Sekang High School and his mother is a famous actress, but his classmates don't know about this. He is portrayed as a happy-go-lucky person who just wanted to cause trouble, but behind his smile, he was actually a struggling child with a painful life. He suffered a lot but everything changed when he met Lee Eun-bi and stood by her side, even when Kang So-young decided to make her life hell. He developed one sided feelings for her and confesses to her later on.

Nam Joo-hyuk as Han Yi-an
A star swimmer at Sekang High School. He was great childhood friends with Go Eun-byul, and had feelings for her. He is loyal to his friends and although from a poor background, works really hard to help his father at the same time to become a national champion in swimming.He starts to question the identity of Eun-byul (who is actually Eun-bi in disguise), but as time goes by, he falls for Eun-bi unknowingly.

Lee Pil-mo as Kim Joon-seok
He is pricked by his guilty conscience after a massive cover-up involving the death of one of his students.

Lee David as Park Min-joon
An intelligent and hardworking student who is always at the top of his class. Pressured by his study-centric mother to do well, he feels overwhelmed.

Kim Hee-jung as Cha Song-joo
Go Eun-byul and Lee Shi-jin best friend. She is torn between staying loyal to Eun-byul and accepting So-young's friendship advances. After finding out Lee Eun-bi's real identity she also became best friends with her.

Lee Cho-hee as Lee Shi-jin
She is best friends with Go Eun-byul and Cha Sung-joo. She is jealous of her friends who seem to have a passion and tries to seek out one of her own. After finding out Lee Eun-bi's real identity she also became best friends with her.

Cho Soo-hyang as Kang So-young
A school bully who found pleasure in bullying Eun-bi. Her transfer to Eun-byul's school soon leads to mistrust and problems between the students.