Wooh! Two cameos in one episode.
And one of them is a return cameo from JOTA, as he reprises his character on Weightlifting Fairy Kim Bok Joo in Episode 15.
Although it’s a barely-there-appearance with no dialogue, we at least noticed him. He’s that guy that showed up to the party, made an appearance, and then slipped away when no one was looking.
So you may easily have missed it. What with Nam Joo Hyuk’s abdominal distraction and all. Happy cameo hunting in dramaland, y’all.