Choo Soo Bin

The web drama tells the story of a popular orthopedic surgeon, Oh Kyung Hwi, who used to be a loner and a bullying victim during his highschool days. In order to save his first love, who committed suicide, Kyung Hwi goes back in time to when he was 18 years old.

Lee Gwang Jae is the son of a rich family who is reckless and immature. His father dies and leaves behind large debts. Gwang Jae promises to pay off his debt for his father's honor, but it's not as easy as he thinks. Kim Young Ha supports Gwang Jae with her positive personality and love, giving encouragement to him whenever he needs it.