Born in Seoul, Cha Inwoo has been working as a psychological therapist at the Narae Psychological Counseling Center near Pungnaptoseong Fortress for 30 years. He is the author of The Girl Who Picked the Golden Apple, Loyal Brothers, and Blue Fish. Cha wrote this book out of a desire to set the minds of children at ease with the symbols inside, as symbols can have a great impact on the healing process.