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Castle J

Castle J

Stage NameCastle J
Full NameSon Seong Jun
Country of BirthKorea
Date of BirthMay 31, 1999
Age23 years old
Blood TypeO

Not Ranked



Son Seong Jun (손성준; born May 31, 1999), better known as Castle J, is a South Korean singer. He is the leader and the oldest member of the Kpop group MCND under TOP Media.


Stage Name: Castle J

Full Name: Son Seong Jun

Native Name: 손성준

Birth Place: Korea

Birthday: May 31, 1999

Height: 176 cm (5'9")

Weight: 60 kg (132 lbs)

Blood Type: O

Zodiac: Gemini


Fun Facts and Trivia

  • Age trivia: Castle J was 20 years old (international age) when he debuted with MCND on Feb 27, 2020.
  • Position: leader, main rapper.
  • Hobbies: watching movies along, eating by himself, listening to music, and shopping.
  • Specialty: composing music.
  • He started as a child actor.
  • He likes music and games, the color purple, and rolls.
  • He dislikes snakes, bees, and sports.
  • He is a Taekwondo 3rd dan.
  • He is an only child.


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