Killing Stalking

Killing Stalking () is a South Korean manhwa written and illustrated by Koogi. It was published online in Korean and English by Lezhin Comics and won the ₩100,000,000 Grand Prize Award at the Second Lezhin World Comics Contest.
Plot.
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.
Characters.
Yoon Bum is the main character of Killing Stalking. Due to his parents dying when he was little, Bum was given to his grandmother and uncle with the latter severely abusing, raping and starving him, making Yoon Bum a lifelong abused victim due to also getting bullied in school, getting sexually abused and raped in military and Oh Sangwoo abusing him in several ways as well. Bum is a quiet, shy, timid, and sensitive individual who suffers from BPD and often struggles socially. Seeing affection towards him as a sign of love, Bum becomes easily attached to people who show him affection due to his lonely desire for it since he's never having gotten any before. Dealing with his uncle's abuse, loneliness, and thinking that he isn't needed by anyone, Yoon Bum cut his wrists in the past regularly to cope. Central to Yoon Bum's character is his obsessive love for Oh Sangwoo, a university classmate with whom he serves in the military. Bum enrolled in college four years late and met Sangwoo in the second semester of his first year of Sungsoo University. Due to the requirement for mandatory military service in Korea, Bum receives affirmation of his enlistment after his first semester of college, despite his previous presumption that his low body weight would exempt him from active duty. He is ostracized in his unit, and his commander attempts to rape him. He was told later that the attempt was stopped by someone thanks to Sangwoo's intervention and it led Bum to see him as a saviour. After Bum completed his military service, he sees Sangwoo with a girl, ending up in despair as he now thinks Sangwoo is straight. Bum's crush transforms into an obsession, mostly fueled due to the fact that Bum suffers from Borderline Personality Disorder and Sangwoo was one of the first persons who, in Bum's eyes, showed him affection by saving him. Although he attempts to deny his feelings of attachment toward Sangwoo, Bum is unable to stifle them and "wouldn't be able to forget as easily as before."
Oh Sangwoo is the second main character of Killing Stalking, the primary Antagonist. He is a classmate of Yoon Bum after Bum enrolled college for 4 years and is enlisted in the same military unit as him. He saves Bum from an attempted rape by his superiors, which causes Sangwoo to become the object of Bum's obsessive affections. Sangwoo is frequently seen in the company of female admirers for his good looks. He adopts a "happy, energetic" face and is shown to be often smiling, even when making eye-contact with strangers in social surroundings. During his time at the university, he appears to be an extroverted person with a large circle of friends. According to Bum, he attracted many with his "empathetic, considerate, gentle aura". These traits, however, mask his true psychopathic, violent and sadistic characteristics. Sangwoo is actually a cruel and ruthless individual who kidnaps, abuses, tortures, rapes and kills people, showing absolutely no mercy to his victims or remorse for any of his actions. He's highly narcissistic and looks down on everyone, pretending that he actually cares for others, only to strike them with honest hostility when he feels like it. His emotions, when facing his victims, alternate unpredictably between fake mercy and violent hostility. He tortures his victims slowly, yet with a certain pace, selecting to also manipulatively coddle them with simpering words and conduct before returning to his brutality. He favours female victims, though isn't hesistant about males either despite having not murdered a man since his father's death in high school.
Yang Seungbae is a former investigator who has been demoted to patrolling police officer. As noted by his superior, he appears to pry too much into investigations and trusts his (usually accurate) intuitions even when lacking evidence. Dutiful and prone to skepticism, he often second-guesses others' conclusions. These traits prove to be detrimental, as they cost him his position on the investigation team. Three years earlier, he had looked into the murder of Oh Sangwoo's parents. Though the case was declared cold, he investigated further and became suspicious of the assumption that the culprit was a burglar, finding the evidence of a break-in too convenient. This left him apprehensive of Sangwoo's character.