The "I Like Sundays - Running Man" member Ryoo Seung Soo said he taught acting to actor Jo In Sung.

On the SBS entertainment program "I Like Sundays - Running Man" which aired on April 6, 2014, each of the Running Man team members invited a guest and went on a trip together using public transportation.

Ryoo Seung Soo teamed up with Yoo Jae Suk and got on the train to get to the destination. Song Ji Hyo joined them with singer Dong Joon, and Gaeri joined them with Lee Sang Hwa. When Song Ji Hyo said on Ryoo Seung Soo, "He used to teach acting, and he was one of the judges for the movie 'High school scary story.' He is very popular among actors. He is really good at teaching acting." Yoo Jae Suk added, "Ryoo Seung Soo runs his own academy." When people asked him who were some of the popular actors enrolled in his academy was, Ryoo Seung Soo said "Jo In Sung." Ryoo Seung Soo added, "I could not receive the tuition from him. I thought he would do well."

On this day's episode, Ryoo Seung Soo, Lee Sang Hwa, Kim Jung Nam, Kim Min Jong, Oh Man Suk, Im Joo Hwan, and Dong Joon appeared in addition to the regular Running Man members. They went on completing missions while on a train going to a trip together.