There's a special cameo in episode 7 of Jeju Island Gatsby (aka Warm and Cozy), but it's not an actor or idol who shows up on the screen. JYJ's Junsu's pet dog Xiahki made an appearance in the series as Lee Sung Jae's character's pet.

In the series, Lee Sung Jae plays Song Jung Geun, a successful resort owner. The resort scenes are filmed at Junsu's luxury Toscana hotel on Jeju, so when filming scenes of Jung Geun relaxing at home, Junsu's beloved Samoyed Xiahki was the natural choice as the character's furry friend!

Junsu fans, did you catch the cameo? You can re-watch the scene in episode 7 below: