Actor and singer Si Won, who stars on the popular MBC Wednesday Thursday drama 'She Was Pretty,' shared a photo of himself with the MBC entertainment program 'Infinite Challenge' members. Today on his Instagram account, Si Won posted a picture of himself with the MBC entertainment program 'Infinite Challenge' members, posing endearingly. The MBC entertainment program 'Infinite Challenge' members were disguised as "laughter hunters" for the upcoming episode. In related news, on the most recent episode of the popular MBC entertainment program 'Infinite Challenge,' which aired on Oct. 24, 2015, the MBC entertainment program 'Infinite Challenge' members and the 'Idiot Avengers' team members competed against the brainy competitors such as Kim Goo Ra and Jeon Hyun Moo on rounds of quiz games. The 'Idiot Avengers' team was losing at first, but eventually won the game, brining a happy ending to the team. The MBC entertainment program 'Infinite Challenge' is one of the popular, long lasting entertainment programs in Korea. It features the Infinite Challenge members Ha Ha, Park Myung Soo, Yoo Jae Suk, Jung Joon Ha, Kwnaghee and Jung Hyung Don.