Before entering the entertainment industry, Lee worked as a recreational instructor, and entered a singing contest on
MBC's
River Music Festival (). He was also an
aerobics instructor. In October 2006, he began his own online internet shopping mall, selling clothes. In May 2008, he became an
ambassador for the Pork Management Committee () Lee has appeared on many
reality-
variety shows. He made a breakthrough in his career after appearing on
KBS'
Happy Sunday:
1 Night 2 Days. He was seen as the most hardworking member of the cast and was in charge of driving in the show, as he had a commercial
coach license. After appearing on the show, he earned more recognition and was offered
MC roles on other shows, such as season 2 of
Sang Sang Plus, his first TV appearance in the role of an MC. His marriage was broadcast on national television on
1 Night 2 Days. Up until 2012, he was signed under
Castle J Entertainment, and on September 19, it was announced that he had signed exclusive contracts with SM C&C, a subsidiary of
SM Entertainment, along with
Kim Byung-man, immediately after fellow national MC
Kang Ho-dong and
Shin Dong-yup joined. In December 2015, he reunited with Kang Ho-dong as a cast member for
JTBC's new variety show,
Knowing Bros. In 2017, Lee Soo-geun appeared in more than ten programs. In 2024, he left SM C&C and joined BPM Entertainment. ==Personal life==