He is famous as an artist who creates a calm, deep resonance and emotion by drawing very delicate scenes of trivial scenes that are easily encountered in everyday life. She is a picture writer who is praised for depicting children in the most childlike way. She is also an author who broke the prejudice in the world of children's books that young children would not be able to follow the story, and led picture books into a world with rich stories. She published her first picture book in 1973, and was later selected as a participating author in All in a Day, an international collaborative work for world peace by Mitsumasa Anno, a leading Japanese artist. He won the 2nd Picture Book Japan Award for “What Day Is Today,” the Sankei Children’s Publishing Culture Award, the French Picture Book Award for “Bathing is Fun,” and the Kodansha Publishing Culture Award for “Eunji and Fluffy.” His works include ≪Goodbye Moon≫, which is much loved in Korea, as well as ≪Iseul's First Errand≫ ≪Chick≫ ≪Paper Airplane≫ ≪Eunji and Fluffy≫ ≪Kiki the Witch's Delivery Service≫ ≪Magic Paint in the Forest≫ ≪Today What day?» etc.