The story takes place in a medium-sized coastal city. Lin Yu (formerly known as Lin Feng) studies in the city's key high school. The high school life atmosphere is tense but youthful.
There is a switch between two lives in the story: in the first life, he was a male high school student Lin Feng, who died in an accidental car accident; in the second life, he was reborn as a girl Lin Yu. The story focuses on depicting her complex emotions and growth process as she regains her youth, high school life, and relationships with family, friends, and lovers.
