Changbin is one of the rapper and producer of the group. He is cheerful and likes writing lyrics and rap.

He was born in Yongin, South Korea. He has an older sister. He graduated from Bora High School and trained for 2 years. He got in the pre-debut group/sub-unit 3RACHA with Chan and Jisung, his stage name in 3RACHA is SPEARB

He likes listening to music and to go shopping. He loves to listen to Kenrick Lamar.