I can't remember the title but it was a webtoon set in a uni campus where the seme (black haired dude, comes across as a bit psycho and like he needs a good night's sleep) would keep waking up and repeating the same day unless and until he finds the uke (brown haired guy) who he ends up calling 'hyunnie' I don't remember if his name was yuhyun or something similar, but he's obsessed with keeping him alive. But it's like a zombie apocalypse at the school people are turning into the living dead and they keep running into bad situations. Any help would be much appreciated.
What an absolute mindfuck, but hey happy ending y'all!