Having lost both of his parents as a kid and being abused, bullied, and neglected by everyone throughout his life, Yoon Bum is a withdrawn, shy, timid, and sensitive individual who suffers from BPD and often struggles socially. Due to the actions of his uncle and Sangwoo, Bum is often seen with bruises throughout the story. He also has a scar on his chin from Sangwoo (Due to him slashing Bum's chin open in Chapter 8), and more on his wrists from self harming. The wound on Bum's chin after the bandages were taken off.

According to the girl from Chapter 41, Bum's hands are slender and pretty. Even Sangwoo recalls it often throughout the story and how Bum reminds him of his mother, as well does Bum's Uncle state how Bum looks like his ex (Bum's mother), even back when Bum was in elementary school. Outside of that, his figure is often reminded to the readers to be very feminine. However, after Sangwoo breaks his ankles and traps him in his house, Bum is generally seen in an oversized shirt and a dark skirt with bandages wrapped around his legs, with the later additions of them along his collarbone and jawline. According to Yoon Jae who went with Bum to the same elementary and middle school, Bum's face hasn't changed at all since then, claiming that Bum always looked depressed back then too.īefore entering Sangwoo's home, he was often seen wearing a dark green winter coat with a striped shirt underneath.

Bum usually carries a worried expression on his face and hardly ever smiles. Bum is quite small for his age, standing over 160 cm, and has a youthful and boyish face (Being called someone's 'Baby Brother' once and a kid sometimes), easily looking like as if he just got into middle or high school even though he's his late twenties, being 4 years older than Sangwoo. He has straight short black hair with bangs that part down the middle of his forehead and black eyes with what appear to be notable bags under his eyes. Yoon Bum is depicted as a scrawny young man, being underweight due to being malnourished by his uncle since he's little, causing his body to be underdeveloped.

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