The Killer Who Loves You is a Manga/Manhwa/Manhua in english language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

Suzuki Ryuuto is an introverted, timid college student. Every day he puts on a fake smile, trying his best to blend into a group of outgoing students even despite cruel teasing about his virginity.

But one day, he comes to a drinking party where he meets a beautiful girl, Kokoa. Per her request, he starts to pretend to be her boyfriend to ward off the stalker who is harassing Kokoa.

That tender love was the beginning of a tragedy…