Hyunjin is of average height with a lean and athletic build. His hair is jet black and falls in messy around his face. He has piercing almond-shaped black eyes and sharp features. Due to his unique condition, his body bears faint scars and marks from previous episodes. Hyunjin is initially reserved and cautious, often keeping to himself due to the fear of losing control. He is also curious and intelligent, always seeking answers to understand his condition. He is fiercely loyal and protective.