Trying to find this

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.