Castle J
 
MCND X V School
MCND's Crazy School
MCND's Crazy School 2
 
 
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Castle J
 

Stage Name: Castle J (캐슬제이)
Birth Name: Son SeongJun (손성준)
Position: Leader, Main Rapper, Lead Dancer
Birthday: May 31st, 1999
Zodiac Sign: Gemini
Blood Type: O
Nationality: Korean