Actor Jo In Sung has officially joined "Infinity Challenge's" rowing team. On the upcoming episode, Jo In Sung will be rowing with the members of the show, which will be Infinity Challenge's third straight special on rowing. The event for this episode was titled "Jo In Sung Comeback Work - What Happened in Misari". When Jo In Sung made his sudden appearance, the cast members were stunned. He came in comfortable workout clothes and immediately was tested to see his ability to join the rowing team. He had a psychological test, an affinity test, and a physical test. In the affinity test, he had the challenge of trying to obtain Jung Hyun Don's number. During his attempt, Jo In Sung made everyone on the set laugh with his jokes and showed off his witty humor. Jo In Sung also took part in actual rowing practice and eventually worked as a really helpful member for the team. All the members of the cast began training for the rowing specials last March and will take part in a heated competition on the 30th. Source: Money Today via Nate