MCND (Top Bro jr.) The final group is supposed to have 8 members (MCND + Shin Yechan (1the9) and 2 more trainees). All the members (minus Junhyuk) trained in the USA for roughly 1 year in total. They took part in 2 dance events (Feedback Competition Youth and World of Dance) in 2017 as Super Rookie Rookie Rookie.     Castle J (캐슬제이) Real name : Son Seongjun (손성준) Birthdate : May 31, 1999 Position : Leader, rap, dance Trivia : • Child actor • ...