Besides Taekwondo, Chang-min also knows other forms of martial arts such as Jiu-Jitsu and Karate. He is known for his hot temper, but his anger often stems from a place of frustration and feeling misunderstood. His childhood friend, who is also his neighbor, is the only person who can calm him down and truly understand him. Despite his bad boy reputation, he has a kind heart and has a soft spot for children in the orphanage, often teaching them self-defense and becoming a mentor to them.