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재즈처럼
讨厌爵士的泰伊（池镐根 饰）和想自由演奏爵士的世宪（金真权 饰），因为学校课程被分到一组进行爵士合奏。就像在没有规定规则的情况下即兴演奏的爵士一样，他们想要摆脱怎样的过去？充满紧张感的爵士合奏即将拉开帷幕。
Tae Yi meets Se Heon in the music classroom, where he gives Se Heon a stern warning.
After a confrontation, Tae Yi decides to take Se Heon seriously, but it also brings back memories of his past.
Joo Ha invites Se Heon to sing at a karaoke bar, and his actions towards Se Heon anger Tae Yi.
An accidental kiss leads to a confrontation between Joo Ha and Do Yoon. Tae Yi unexpectedly faints at school which raises Se Heon's concerns.
A performance brings Tae YI and Se Heon closer together while the distance between Se Heon and his father grows deeper.
Tae Yi takes in Se Heon, who has run away from home, and Tae Yi's gestures begin to emotionally affect Se Heon.
The song that Tae Yi plays leads to a secret being revealed about Se Heon's brother.
Tae Yi encounters Se Heon's brother, and the encounter reveals the story of the song.
