In the winter of 1998, Chen Su, Wang Jiming, Lin Weixi and Li Mao were four good friends preparing to enter junior high school. One day, Lin Weixi picked up a wallet at the back door of the school cafeteria because she was late. The head teacher Liu Benye recognized it at a glance as Xiao Xuemei's... Chen Su disappeared inexplicably, and the four people's childhood came to an abrupt end. After many years, when Chen Su appeared in front of them again, things had changed.
Concept: Everyone has been a child, but not everyone has been a good person.