Castle J
castle j
PC: TOP Media

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Castle J is a South Korean singer and actor. He started his career as a child actor in 2009 and made his debut as the leader of the K-pop boy band MCND.

NameCastle J | 캐슬제이
Full NameSon Seongjun | 손성준
BornMay 31, 1999
HometownSeoul, South Korea
Height175cm | 5′-09″
Shoe Size265-270mm
Blood TypeO
FamilyMother, Father, Two Dogs
EducationAnyang Arts High School
Baemoon Middle School
Years Active2009 – present
PositionLeader, Main Rapper
LabelTOP Media


2012 Test Flight Jungho

TV Series
2013 The Queen’s Classroom Han Kook
2012 A Wife’s Credentials Cho Jaehoon
2011 TV Tale
2010 President young Baek Taewook
2010 Drama Special – Last Flashman Donggun

Castle J Facts

  • He graduated from Anyang Arts High School (Department of Drama & Film).
  • Hobbies: listening to music, going to the movies alone, eating alone, shopping
  • Specialty: music composition, acting
  • His childhood dream was to become a superstar.
  • Choi Yoojung (Weki Meki) has been his friend since childhood.
  • He participated in Kpop Star.


  • Gongryong (dinosaur): Fellow MCND members call him Gongryong.


  • Beverage: coffee, Coca-Cola
  • Food: meat dishes, raw fish
  • Season of the Year: spring, fall, winter
    (least favorite: summer)


  • Mother
  • Father
  • Rookie
    Breed: Shiba Inu
  • Merang
    Breed: Shiba Inu

References: MCND Debut Showcase, NewsAde

Kpop Idols Born in 1999 | Kpop Idols Born in May