"Yeoyoudang" means a library of old scholars who lived in Gangchon. With the spirit in its mind, starting with its Ah! That's Our History series, YEOYOUDANG has published picture books and non-fiction picture books with lovely illustrations and words, children's and youth literature, biographies and humanities books that light up our lives. It publishes books one by one with great care with the hope that a book will bring fun. It has published over 120 books so far.