Doomsday: An Older Woman Helps Me Become an S-Rank Powerhouse

Chen Ping is a lovesick fool hopelessly devoted to campus belle Lin Yanran. In the apocalypse, he loses everything and is killed by her and her blond-haired boyfriend. After being reborn, Chen Ping finally realizes who he should have been protecting: the woman who saved his life several times during the apocalypse! So, after being reborn, he stops fawning over the campus belle.