Ongoing キリング・ストーキング (Japanese); 킬링 스토킹 (Korean)

Read Killing Stalking Manga:
Yoon Bum, a scrawny quiet boy, has a crush on one of the most popular and handsome guys in school, Sangwoo. One day, with Yoonbum obsession towards Sangwoo reaching its peak, Yoon Bum decides to enter Sangwoo home. But what he saw inside was not the Sangwoo he had dreamed of.

List of Chapters