On SBS's popular entertainment program "I Like Sundays - Running Man" which aired in the evening of Sunday, December 22, 2013, the Running Man members could not hide their bewilderment after seeing a mysterious video. In the beginning of the episode, the Running Man members gathered around at the opening ceremony with the Christmas spirit and waited for the last member, Gaeri, to show up. However, even after waiting for a long time, Gaeri never showed up and a mysterious video was delivered to the Running Man members. In the video, Gaeri, whose hands were cuffed, was shouting to save him. The Running Man members then had to rescue Gaeri in addition to finding the suspect of Gaeri's kidnap on this day's episode, which played out with the theme of "Nightmare of Christmas." After tracking down the mysterious number that was left on Gaeri's cell phone, the members found out that the owner of the mysterious number was Gil of Ri Ssang. The members then took their individual journey to meet Gil.