Shou was a vicious villain who tortured Shou, and Shou died of cancer. Gong originally thought he liked Shou's half-sister, but after Shou's death, he discovered that he liked Shou. He couldn't accept Shou's departure and broke down. Shou, who was tortured by his rival Gong, was reborn and returned to the summer when he was 17 years old, the summer before the tragedy happened...
Concept: Two teenagers who are not in love with each other have been sworn enemies since childhood. Through various misunderstandings, they understand each other's sincerity, and this belated love finally gets a response. It's also the ignorance and ignorance of youth. Cherish the people in front of you. Don't know how to cherish until you lose them.