Yoon Kyun-sang made his screen debut in the 2012 South Korean television drama series ‘Faith’ where he portrayed ‘Oh Deok-man.’ In 2013, he made his silver screen debut in the South Korean sports film ‘No Breathing,’ directed by Jo Yong-sun. The film grossed over US$2.7 million at the box office. In 2014, he became a part of the South Korean television series ‘Pinocchio,’ directed by Jo Soo-won and Shin Seung-woo. He played the role of ‘Ki Jae-myung’ and remained a part of the series until it went off-air in 2015.
Yoon Kyun-sang next grabbed the role of ‘Woo Ji-han’ in the 2015 South Korean comedy film ‘You Call It Passion,’ directed by Jeong Gi-hun. The film grossed over US$4.26 million at the box office. That same year, he joined the cast of the South Korean television series ‘Six Flying Dragons,’ directed by Shin Kyung-soo. The series aired 50 episodes before going off-air in 2016. He was next seen in television series such as ‘Gogh, The Starry Night’ (2016), ‘The Doctors’ (2016), ‘The Rebel’ (2017), ‘While You Were Sleeping’ (2017), and ‘Oh, the Mysterious’ (2017-2018). In 2018, he joined the main cast of the South Korean television series ‘Clean with Passion for Now,’ directed by No Jong-chan. Kyun-sang played the role of ‘Jang Seon-kyul’ and remained a part of the show until it went off-air in 2019. He was last seen playing the role of ‘Min-su’ in the 2022 South Korean web series ‘Rose Mansion,’ directed by Chang.