I'm looking for a webtoon where the main character is not a human anymore becaue the he was bitten or something. There's an organization of people that like him and he joined that organization. The organization banned the monster to kill human. If they kill human and they will be killed in exchange. The origin of the monster is from a woman who drink water from cave and since that, she changed. The first chapter was about the main character playing football/soccer and after that he went to his crush birthday which he gave her a doraemon watch. Then he went for a vacation with his schoolmates which he lost his memory for a month. The next scene was when he play basketball and his schoolmate killed by a monster that lost controlled which then the mc killed the monster and also his friend that also turned. There this girl who looks cold and she is from organization. She also a monster and she then became a transferred student.
Sorry because my explanation is not in order. I hope someone can tell me what the title of the webtoon that I read.

I think you're talking about Infectee

Asleep