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.

• Minho
• Lee Yu-bi
• Kim Bo-mi
• Kim Hee-chan
• Choi Seo Hyuk
• Yoo Joon-hong
• Choo Soo Bin
• Min-seo