Dec 22, 2023-present
Yook Sungjae (육성재) is a South Korean singer and actor under IWill Media. He is the Lead Vocalist, Maknae, and Face of the BTOB. In 2019, he became the group's leader due to Eunkwang's Military Enlistment.
He made his debut as a member of BTOB on March 21, 2012 with their first single "Insane".
Sungjae enlisted on May 11, 2020 and was discharged on November 14, 2021.