This storyline is a very beautiful, sad this will make you laugh/giggle and cry. Lin beixing time travel back to her senior year and she finds out a weird thing that everytime when the exams are done she goes back but she finds out that Zhang wansen dies every time she goes back and she finds out her fiancé and her best friend got together when her fiancé broke up so Lin Beixing had to make sure that Zhang Wansen doesn't die, She had to figure out why he jump off. After Lin Beixing and Zhang Wansen got gradually closer they started to fall in love with each other but they met at a young age ( childhood sweethearts ) Zhang Wansen had a crush on Lin Beixing then but Lin Beixing forgot about him since he moved away when he was younger but went back for her. ( I can't spoil more you guys have to watch it!!) Zhang Wansen will always like Lin Beixing no matter what!