Yook Sung-jae is a South Korean actor, singer, and performer, best known as the member of the boy group ‘BtB’ and ‘BtB Blue.’ As a ‘BtB’ member, he made his debut in 2012 with singles such as ‘Insane’ and ‘Imagine.’ He made his acting debut in South Korean TV show ‘Monstar.’ He had his first lead role in the TV series ‘Plus Nine Boys’ in 2014. His breakthrough came in 2015 in the TV drama ‘Who Are You: School 2015.’ He became majorly popular after this show. His other appearances came in shows such as ‘Reply 1994’ (2013), ‘The Village Achiara’s Secret’ (2015), ‘We Got Married’ (2008-2017), and ‘Law of the Jungle in Sumatra’ (2017). As a host, he appeared in ‘The Show’ (2012), ‘A Song For You’ (2014), and ‘Inkigayo’ (2015). He currently stars in the TV show ‘All The Butlers’ (2017).