This work is based on the "letter game" that a high school Chinese teacher proposes for the whole class to participate in. This is a letter for each person to write a sincere letter to someone in the class anonymously, and the letter contains shocking content such as love confessions and revelations. The atmosphere of the game was unexpectedly enthusiastic, and the students learned about the different sides of their classmates and cultivated camaraderie in the process of arguing and helping each other.