Lee Jae-Joon (이재준) better known by the stage name Cosmic Boy (코스믹보이) is a South-Korean producer currently under CRAFT AND JUN and part of the WYBH crew alongside artists such as george, Kim Seungmin, APRO, Kid Milli and GIRIBOY. However, he first debuted in 2018 under Stoneship with his EP Can I Cosmic and was a former member of the areyouchildish crew. On September 23, 2020 he released a collab album with george titled Love in summer.