Dex surprised viewers by making an unexpected appearance on the March 30th episode of KBS 2TV's '2 Days & 1 Night Season 4', where he jokingly teased about taking Kim Jong Min's place on the show during Jong Min's temporary leave for his upcoming wedding. The episode featured the conclusion of the members' "KBS Castaway Journey" at various locations within the KBS building, with Dex joining as a special guest through his connection with DinDin.

During the show, Jo Se Ho mentioned Kim Jong Min's impending marriage and suggested a potential opening in the cast, leading to speculation about Dex filling the void. Dex responded playfully, showing interest in joining the show and creating a fun atmosphere reminiscent of a playful "threat" to Kim Jong Min's role.

After filming, Dex expressed his gratitude for being on '2 Days & 1 Night', a program he had long admired, and credited his friend for helping him display his true self on the show. Playfully, he hinted at being available to step in when Kim Jong Min takes a break, prompting laughter and enthusiastic responses from the other cast members, who eagerly invited him to appear in April.

Amidst the banter, Kim Jong Min joined in the humor, suggesting Dex should come on the show when he's absent, resulting in more laughter among the group.