Wang Zhiwen said: Do not easily sympathize with others. Humans are a kind of cruel animal; if you let them go, they may not let you go. Some people cannot be deeply involved with, and some people are a mistake even to know. Many things end quietly; what answers are there? Silence and estrangement are the answers. In the adult world, there are no farewell ceremonies, only tacit estrangement and an unspoken cessation of contact.