Help me find this movie please :(

Hi all, I watched this Asian psychological thriller(?) when I was really young, maybe around 2000s - 2010s. I remember enjoying it and would love to really rewatch it.

I don’t remember a lot of details. And I’m going insane trying to look for it. Pls help 🥲

Story is there is a group of a people in an island (?) There was part of the story reveals that their watches and compasses were not working properly because of the island's magnetic field. They might have been on top of a volcano or something

Also part of the reveal in the end is some members of the group are tricking the others.  For example, things went missing from small to big items like a closet and an entire room in the building they were staying at. It turns out it was some kind of deception- some of them were trying to make it look like things are just missing when it in fact is 2 different buildings at other sides of the island.

Thank you all in advance! ♥️