Lee Won-geun is a South Korean actor. He made his acting debut in the 2012 popular historical television drama Moon Embracing the Sun (2012) and is best known for starring in the high school drama Cheer Up! (2015) and One the Woman (2021), as well as the film Misbehavior (2017).

One the Woman is a 2021 South Korean television series directed by Choi Hyeong-hun and written by Kim Yoon. It stars Lee Hanee in a dual role, Lee Sang-yoon, Jin Seo-yeon, and Lee Won-geun. The drama premiered on SBS TV on September 17, 2021, and aired every Friday and Saturday, at 22:00 (KST).