In 2012, with the opening up of the two-child policy in China, many families have a second child. The adolescent brother gradually grows apart from his parents, and the two generations do not understand each other, deepening the emotional rift. Gradually, the brother felt that the love of the parents for the two siblings was skewed. Coupled with the decline of his brother’s performance, the only dog he loved at home “Mocha” was sent away by his mother. Backlog in the heart of injustice, discontent, anger broke out in a moment.