Basically, he is stoic and has a chic personality. Because of this, he gives off a cold and indifferent impression at first glance, and combined with his shy nature, he is somewhat clumsy in interpersonal relationships. However, he has an unexpected side where he treats those he has opened up to gently and quietly looks after them. Despite his cool demeanor, he can be surprisingly swept up in his emotions; when truly enraged, he gets excited and snaps at the person he's angry with quite fiercely. He is more mature than other kids his age. Therefore, he usually hangs out with Hana, who has the most similar personality. Because of this mature vibe, he often attracts girls. That said, he isn't completely without a childlike side. While he is seen crying occasionally, he never wails loudly. He is quite quick-witted and grasps situations rapidly and accurately. He looks even more mature because he is somewhat tall. His left arm and left leg are robotic. Being a man of few words, he doesn't express himself much, but he is thoughtful and has a delicate side that cares for his family and friends. He asks his father, Limo, to reinforce his left arm and becomes Super Boy. He is famous as the 'Church Oppa' at Daedo Church, causing the number of women attending the church to increase. He is 21 years old and a freshman at Daedo University.