Zhang Yan University has been secretly in love with the head teacher Mai Lingchen for four years. On the occasion of graduation, I confessed to Mai Lingchen, but I didn't expect that Mai Lingchen had a boyfriend and was about to get married. Zhang Yan was very sad, but he met a strange old man on the beach and gave him a pocket watch. He didn't expect that this pocket watch was not a simple pocket watch, but a time watch that allowed Zhang Yan to return to the past. One day, Zhang Yan learned that Mak Lingchen and his boyfriend knew each other because of the robbery four years ago, so he started the timetable to go back to the past, and met Lingchen repeatedly to rescue him, and finally rescued Mak Lingchen and fell in love with her.