Cha Heon is a student at Chun Ji High School who has both good looks and brains. He appears to be a cold character, but he is actually someone with a warm heart who is awkward at expressing himself well. Shin Sol Yi is a bright and bubbly 17-year-old who has a crush on Cha Heon. She openly confesses her love to Cha Heon continuously, and she is a clumsy but lovable character.
Woo Dae Sung is a talented swimmer who transfers to Chun Ji High School and falls for Shin Sol Yi. He does not express his feelings for her and quietly stays by her side.