Yoo Jae Suk expressed his sorrow about his son on the 300th episode special of 'Infinity Challenge'. The members got into tents with 1 or 2 other members and talked about their honest feelings on this episode.

Yoo Jae Suk was in a tent with Jung Hyung Don when the latter asked him, "Recently, your son said to you, 'Dad can't go to those [public] places', didn't he?", recalling back to a time when he had overhead Yoo Jae Suk's son tell him he couldn't go to an amusement park.

Yoo Jae Suk quietly said, "The exact phrase was, 'Dad can't go to places with lots of people'. I want to take him there so much. I'm okay with it, but my family won't be able to enjoy themselves." Jung Hyung Don added on, "So later on, dad won't be included in the family photos. That's sad.."