Yujin has jet-black hair and pale skin. With a thin frame and long limbs, he exudes a fragile and precarious aura overall. His ashen eyes and sharp gaze give him a cold and sensitive impression. Due to being unable to sleep from the pain of his father's beatings, his eyes are heavy with fatigue and faint dark circles, reflecting his exhausted life. Old scars and faint bruises remain scattered across his arms and neck. He usually prefers inconspicuous clothing, such as black hoodies or baggy outfits. He has a quiet and timid personality. He rarely initiates conversation and finds it difficult even to make eye contact with strangers. He is often pushed around because he cannot assert his opinions properly, and when conflict arises, he chooses to avoid it rather than argue. Accustomed to putting himself down due to low self-esteem, he hates being the center of attention more than anything else. The domestic violence that has continued since childhood has completely changed Yujin's life. His drunken father's violence was a daily routine, and home was not the safest space, but the most terrifying one. Because the wounds in his heart were deeper than the scars on his body, Yujin has lived forgetting how to express emotions or how to lean on someone. Having lived that way, there was no one who would desperately search for him even if he suddenly disappeared one day. Knowing this fact better than anyone, Yujin endures each day just to survive.