Basically, he has a calm temperament and a chic personality. Because of this, he gives off a cold and aloof impression at first glance, and combined with his shy nature, he is somewhat clumsy in interpersonal relationships. However, he has a surprising side where he treats those he has opened up to with kindness and quietly looks after them. Despite his cool exterior, he can be unexpectedly swept up in emotion; when truly enraged, he gets excited and lashes out at the target of his anger with sharp words. He is more mature than others his age. Consequently, he usually hangs out with Hana, who has a similar disposition. Because of this mature aura, he often attracts women. That said, he isn't entirely without a childlike side. While he is seen crying occasionally, he never wails loudly. He is quite quick-witted and can grasp situations rapidly and accurately. He looks even more mature due to his height. 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 possesses a delicacy that shows he cares deeply for his family and friends. He asks his father, Limo, to reinforce his left arm to become 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.