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 was great childhood friends with Go Eun-byul, and had feelings for her. He developed one sided feelings for her and confesses to her later on.Ī star swimmer at Sekang High School. 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 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. His father is the director of Sekang High School and his mother is a famous actress, but his classmates don't know about this. Eun-byul leaves in the end to pursue her dreams whilst Eun-bi remains in the school.ĭescribed by his father an idiotic and problematic child, Gong Tae-kwang is widely known as a troublemaker in school. When Eun-byul's adoptive mother mistook Eun-bi as Eun-byul, she starts to assume the identity of her twin sister. Due to bullying, Eun-bi decided to end her life but she was saved by her twin sister. Lee Eun-bi lives in an orphanage whereas Go Eun-byul, Eun-bi's twin sister lives with a woman who adopted her. Go Eun-byul and Lee Eun-bi are identical twins.