South Korean pop singer who is known as being an original member and lead singer of the boy band BtoB. He was handpicked by Cube Entertainment to begin as the lead singer of the group in 2012.
He and his eventual group mates appeared on the JTBC sitcom I Live in Cheongdam-dong prior to their official debut. They made their first TV appearance as a group on April 4th, 2012 on the TV series Idol Master Zone.
In 2014, he was cast on the South Korean variety show SNL Korea 5. In 2015, he joined the studio panel for the MBC virtual marriage TV series We Got Married.
He was born and raised in Yongin, South Korea. He has one younger brother, Seo Eun-chol.
He was an original member of BtoB alongside Lee Minhyuk.