They are said to be sworn brothers, no matter what they do, they always do it together. They skip class together, fight together, eat together, play games together, and share a dormitory room. They share everything, except perhaps a girlfriend.,Seeing Zhang Yizhen turn and leave, Guan Hao and Liu Xing hurriedly ran up to Zhang Yizhen's face and stopped him: "What's going on You suddenly disappeared three years ago, that's fine. Now you do this again, don't you treat us as brothers",In the midst of their conversation, Guan Hao asked, "Three years ago, what exactly happened Why did you disappear without a word"。