Moon Se-yoon, is a South Korean comedian and television personality. He made his debut in the entertainment industry as a comedian in SBS, starting from comedy Good Friends in 2002. He became popular by appearing on SBS's People Looking for a Laugh and cable channel tvN's Comedy Big League. Currently he is a fixed cast member of Comedy Big League, 2 Days & 1 Night, Amazing Saturday and Delicious Guys, and managed by FNC Entertainment.

2 Days & 1 Night is a South Korean reality-variety show that airs every Sunday at 6:25pm KST on KBS2 beginning August 5, 2007. 1 Night 2 Days used to be one of the two segments on Happy Sunday. The episodes are also uploaded with English subtitles weekly on YouTube through KBS World's official channel. The show's current cast members are Kim Jong-min, Yeon Jung-hoon, Moon Se-yoon, DinDin, Na In-woo, and Yoo Seon-ho. The show's motto is "Real Wild Road Variety." Its main concept is to recommend various places of interest that viewers can visit in South Korea. Filming for every new trip is usually done 2 weeks prior to broadcast on KBS2.