Son Seung Jun, known professionally as Castle J, is a South Korean singer, dancer, child actor and member of MCND (엠시엔디). He graduated from Anyang Arts High School and is on a leave-of-absence at Daekyung University. He first appeared on TV in 2009 when he was interviewed as a child star in "VJ Special Forces" (VJ특공대) and one year later, he made his debut as a child actor in the 2010 KBS2 drama special "The Last Flashman" (마지막 후뢰시맨). He made his singing debut in February 2020 as MCND's leader, main rapper and producer with their first EP, "Into the Ice Age". The group is managed by TOP Media (티오피미디어). (Source: MyDramaList) Watch drama online for free.