Baek Sung-chul made his runway debut at the 2019 F/W Seoul Fashion Week. Apart from walking the runways and posing for magazines, he also appeared in a number of music videos during the beginning of his modeling career. He landed his first acting gig as one of the main characters in the 2021 web drama How To Be Thirty. That same year, he joined TVING’s fantasy series The Witch’s Diner and JTBC’s crime comedy Inspector Koo. In 2022, he was cast in KakaoTV’s rom-com Once Upon a Small Town along with Joy and Choo Young-woo.