Ha invites her friends to camp in a remote forest to search for her uncle who vanished years ago. At sunset, the forest traps them inside a six-sided stone seal after they litter along the trail. No matter where they go, they return to the same spot. They discover the rule: before sunset, they must retrieve everything they discarded. Each recovered item lights one line of the stone. Facing eerie and mysterious sounds, they struggle to finish in time. At the last moment, they realize the final key isn’t something to take back, but something to let go.