Ocha is a painter who draws all sorts of pictures for children's picture books and cartoons. He has worked on illustrations for children's books such as Three Words of English That Make You Speak Fluently and English Masterpieces of Fairy Tales Series as well as the essay Still Little, Little Prince. Ocha previously published the webtoon Mr. Ocha's Slow Walking Day and is currently working under his nickname “Ocha” on “Naver Grafolio.”