He likes to be deep in his thoughts and discover the many stories he has inside him. He is happiest when he takes offbeat ideas, turns them into stories, and writes each story down. His books include Jiyu and the Secret Forest, Every Day with Bori, Anyway It’s the Legendary Martial Arts, 600-Year-old Byeonggu, The Invincible Dog and Cat Investigation Duo, The Diary of Sungmin, and Space Exploration with Marching Four-Legged Spaceship.  ​