Yang Se-hyung is known for his work on a program which had the largest market share for its timeslot as of what date?
Yang Se-hyung: Yang Se-hyung (born on August 18, 1985), is a South Korean comedian, and entertainer. Yang Se-hyung:  His most known for his work on the tvN sketch comedy show "Comedy Big League" and MBC's "Infinite Challenge". Infinite Challenge: Infinite Challenge (; abbreviated as 무도 "Mudo") is a South Korean television entertainment program, distributed and syndicated by MBC. Infinite Challenge:  As of January 2013, it had the largest market share for its timeslot; with between 13 and 17 percent of Korean television viewers watching "Infinite Challenge" every Saturday night.
January 2013