Yoo Jae-suk is a South Korean comedian, host and television personality. He has hosted several variety television shows in South Korea, including Infinite Challenge, Running Man, Happy Together, and Hangout With Yoo. Known for his quick wit and appeal across a wide range of demographics, Yoo has established himself as one of South Korea's top comedians and TV personalities, as well as one of the most well-known and popular celebrities in South Korea.

Infinite Challenge is a South Korean television entertainment program, distributed and syndicated by MBC, that ran from 2005 to 2018.