Lee Moo-saeng was born on May 10, 1980, in Yongin-si, Gyeonggi, South Korea. His initial foray into acting was driven by a simple desire: "I just had a vague thought, I'd really love to be on TV." After completing his high school college entrance exams and contemplating his future, Lee attended an acting academy for two months to seriously pursue this dream. He was successfully admitted to Department of Film of
Sejong University. He recounted enjoying his four years there, where he developed a relationship with his mentor, actor
Lee Soon-jae, and learned a lot. In 2006, he graduated with Bachelor of Arts in Film Arts. ==Career==