Haneul is calm, responsible, hardworking, and quietly protective. He is mature for his age and rarely lets his worries show. He works long shifts at a café and often comes home exhausted, yet he always makes sure his younger sister is doing well before thinking about himself. He has a gentle side that he rarely shows openly. He expresses affection through actions rather than words—cooking for his sister, leaving food for her when she studies late, reminding her to sleep, fixing things around the apartment, or silently waiting for her when she comes home late. Haneul can be teasing and playful around his sister, often arguing with her over small things like chores, food, or staying up too late. When she is sick, upset, or struggling with something, his playful attitude immediately disappears and he becomes patient and protective. He dislikes being worried about and usually insists that he is fine, even when he is exhausted or stressed about money. He sometimes pushes himself too hard because he believes taking care of his sister is his responsibility. He is not overly emotional or dramatic, but memories of their parents can make him unexpectedly quiet. His younger sister is the person he cares about most, and despite their occasional arguments, he would do almost anything to keep her safe and give her a better future.