C69 wave

Before Sun Zihao went to sleep, he knew that Mu Yifan had gone to the great hall to watch television. Because he was worried that Mu Yifan would have something to find him for, he slept with his door open.

When he got up, the television in the hall was still on. He turned off the TV and was about to go out for his morning practice, but the door that had been locked was not locked