Kim Young Shin (김영신; born on June 19, 1988) better known by his stage name 문문 (MoonMoon) is a South Korean singer and songwriter. Prior to his musical activities, he was originally a professional soldier. He served for five years as a navy officer. In his mid-twenties, he went to the Yeoju University Practical Music Department for his dreams of music. When he was a college student, he formed a band called 'Reservoir Daughters' and entered the music world.