Before graduating from university in 2023, Lin Xing had experienced this kind of time travel three times. Judging from these limited three experiences, he believed that the length of time he traveled back to the past should be related to the size of the danger.,He once also thought about whether he, with superpowers, could use his abilities to give back to society, protect the people, and fight crime.,Just then, with a light crack, the front door of the classroom swung open.。