Before meeting Xiao Ming (Yang Jingyi), Xiao Si (Zhang Zhen) was a typical good boy, the hope of his parents and the pride of his siblings (the family hoped that he would be admitted to a prestigious university and would improve the social status of the whole family in the future). He had a friend who liked rock music and called himself "Little Cat King (Wang Qizan)". Although the two would go to the woods to watch people have a tryst, they lived a completely different life from the many teenagers around them who hung out in the "small park". After falling in love with Xiao Ming, Xiao Si seemed to have fallen into a bottomless abyss and began to be led by the nose by various forces from the outside world. Honey (Lin Hongming), the object of his new acquaintance and admiration, died suddenly. The self-esteem and spirit of his father, whom he had always respected, were seriously damaged because of a certain incident. In addition, Xiao Si, who was full of blood and had a strong sense of morality, finally embarked on the road of crime, hoping to end the root of the incident with his own knife. But what Xiao Si didn't know was that the root in his eyes was just an insignificant link in this food chain.