Killing Stalking Series

The story follows Yoon Bum, a young, mentally ill man with a difficult past. After becoming infatuated with Oh Sangwoo, a peer from his time in the military who saved him from a rape attempt, he decides to enter Sangwoo's home while he is out of his house. Yoon Bum finds a tied up, bruised woman in Sangwoo's basement and before he is able to free her, he is discovered by Sangwoo, who is revealed to be a serial killer. Sangwoo then breaks his ankles and despite Yoon Bum's previous love for him, Sangwoo puts Bum into a highly abusive and manipulative relationship until the very end. The books are in different languages.