Lee Chang Sub
Pop Singer
K-pop singer and member of the seven piece group BtoB, otherwise known as Born to Beat. The group debut in March 2012 on the series M! Countdown.
BtoB was formed by Cube Entertainment. It's debut on M! Countdown was streamed live via their YouTube channel.
BtoB has spawned numerous reality shows titled BtoB's Diary, BtoB's Cool Men, and The Beat.
He has posted photos of his mother on his Instagram account.
He is joined in BtoB by Im Hyunsik, Shin Donggeun, Lee Minhyuk, Seo Eunkwang, Jung Il-hoon, and Yook Sungjae.