He debuted his singing and acting career in the same year. Hyo Seop ended up debuting his music career with a four-member group called One O One in 2015. After releasing a few tracks, though, they’ve since remained inactive. But all remained well for Hyo Seop, because in the same year, he appeared in his first drama called Splash Splash Love where he played a small role. He went on to do more supporting roles in dramas such as One More Happy Ending, Happy Home, and Entertainer. He was also part of Always Cantare, a variety show that kept him close to his musical roots.