Young Actors' Retreat

We meet again. (1x1)

:

The casts of Love in the Moonlight, Itaewon Class, and The Sound of Magic are going on a trip together as a group. However, the actors are hiding in different places where they've shot their respective dramas, and Captain Yoo-jung, Captain Seo-joon, and Captain Chang-wook have to find their costars so they can travel to the base camp at Buyeo together. Where would they be hiding?