Yoon Bum is the main character of Killing Stalking.
Yoonbum is depicted as a scrawny young (Late 20's) man due to being underweight. Having straight short black hair with bangs that part down the middle of his forehead and has black eyes with what appear to be notable bags under his eyes. Outside of that, his figure is often reminded to the readers to be similar to one of a woman's. Even Sangwoo recalls it often throughout the story and how Bum reminds him of his mother.
He also has a scar on his chin from Sangwoo, and more on his wrists from self harming.
Yoon Bum is shown as a quiet, sensitive individual who sees affection towards him as a sign of love. Growing up with knowing nothing but abuse at the hands of his uncle, paired together later with Oh Sangwoo's abuse later towards him, Bum developed the mindset of thinking that he's disgusting and deserves to be punished. Dealing with loneliness and thinking that he isn't needed by anyone, Yoonbum cut his wrists in the past regularly. While rather naive, he is definitely not stupid as he was able to stalk Sangwoo who never noticed him, break into his house and almost poisoned him with rat poison once to escape his abuse. He is very timid when it comes to Oh Sangwoo, and sometimes insecure. Though still unconfirmed, it is hinted at the beginning of the manhwa and many signs are shown throughout the story that he may suffer from Borderline Personality Disorder.
Yoon Bum is the protagonist of Killing Stalking. A troubled man with a difficult past, he falls for Oh Sangwoo, a university classmate who served the military with him. Bum's crush transforms into an obsession, leading to him to trespass Sangwoo's house by cracking the passcode on the door and break in. Before succeeding in breaking in he was momentarily stopped by the police. However, he managed to convince them that he was a relative of Sangwoo's and was staying with him for a visit. He is depicted to have engaged in inappropriate behavior due to his BPD, him overly growing strong attachments to people who show him affection and his fear of rejection to maintain relationships with others, most evident in his past acquaintance with a female classmate, enrolled in college four years late due to "Family Circumstances" and met Sangwoo in the second semester of his first year of Sungsoo University. Due to it being required for men and maturing boys to serve in the Korean military, Bum received confirmation after his first semester of college, despite his previous presumption his underweight body would exempt him from active duty. He was ostracized in his unit and his direct commander attempted to rape him. He was told later that the attempt was stopped by Sangwoo. However, it turned out in Chapter 50 that Bum was regularly sexually abused and raped there. When he completed his military service, he saw Sangwoo again with a girl. Although he attempted to deny his feelings of attachment toward him, he was unable to stifle them, remarking them as something he "wouldn't be able to forget as easily as before."
Yoon Bum's mother and father died when he was very young, so he was forced to live with his abusive uncle. He doesn’t seem to have any other family members, he only has his uncle and grandmother left.
Yoon Bum's paternal uncle is severely abusive to him. He raped and beat him regularly. He seems to take his anger over Bum's mother leaving him for his brother, getting married, and having him together.
Though cruel at times, Yoon Bum's grandmother is much kinder than her son. She tries to stick up for him and feeds him against her son's orders. Although unknown if intentionally or not, she told Yoon Bum one day to sleep in his uncle's room, even though she was aware of her son's abuse on Bum, mentioning that she wanted to sleep alone and that her son wasn't coming home in that night, which turned out to be a lie, since the uncle came home when they were sleeping, causing Yoon Bum to get abused by his uncle in his room with a belt, and then raped.
|Main||Oh Sangwoo | Yoon Bum | Min Jieun|
|Police||Yang Seungbae | Officer Park | Junjae|
|Season 1||01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19|
|Season 2||20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35|