He thinks GeonAh is the visual in Dickids and says that he is the nicest.After this, SooRin told him that he would buy him chicken if he joined and so he agreed. After SMTM4, SooRin asked him to join the Dickids, but since he was really arrogant at that time, he said “no” several times.He is a member of xxyxnaf crew as well.He is from Seongnam, but currently lives in his own place in Gwangju (Gyeonggi).He appeared in their M!Countdown stage for the song. He is featured in Ulala Session’s “Beautiful(아름다운 한컷)”.He is from Daejeon, but he currently lives in Yongin.His nickname can be written in different ways: 333, ButtButtButt, Buttx3.He lives alone in an apartment in Seoul.
During the cypher Seo ChoolGoo yielded the mic so he could rap, even though that meant that ChoolGoo himself wouldn’t have time to freestyle. He participated in Show Me The Money 4.In School Rapper he was in team Swings.The other members crash often at his place.He auditioned for Show Me The Money 5, although he didn’t pass the first round.Leader of Dickids Crew and member of the xxyxnaf crew.