MICKY
     Real Name: Park Yoo Chun
     Birthdate: 4 June 1986
     Birthplace: Seoul
     Height: 1.80 cm
     Weight: 60 kg
     Blood Type: 0
     Group Position: Mediator
     Family: Mom, Dad & Younger Brother (RICKY Park Yoo Hwan)
     Close Friends: Kim Hyun Joong ( SS501)
     Religion: Christian
     Education: Kyunghee University
     Hobbies: Composing music / lyrics / rap , piano
     Favourite Food: Jaejoong's Kimchi Jjigae
     Favourite Sports: Basketball
     Favourite Singers/ Celebrateds: HOT, Brian McKnight
     Position: Middle Low Vocal

Yoochun was the last member to join. He is the third oldest member of the group.
He was born in South Korea, but live in America for several years.
His stage name (Micky) was derived from his US name. Coincidentally Micky means “hidden weapon” in Korea.