Na On is obsessed with her dad, Sang Hyun, but that all changes when a young boy makes a visit. As the Yoon Trio falls for the new boy, Sang Hyun feels upset and betrayed. Yeon Woo and Ha Young want to thank Kyung Wan for taking them to Jeju Island. So they dress themselves up and give Kyung Wan the Two Ggoms' Hotel experience. (thetvdb.com)