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Ari, Kim, Momo, Sumi, and Sam are members of a former idol group. One year after the group was dissolved, Sam dies in an accident. During the wake, the ex-members reunite, talk about their memories, and confess things they weren’t able to say before. The origin of the nickname “Sam,” the possibility that it was a suicide, and in the middle of the wake, a message from Sam who should’ve been dead…

The brand new mystery variety begins with only one rule: "Survive, no matter what". For each mission, cast members will enter an unknown, virtual reality space through a secret door. No matter what reality they face through the door, they must endure and survive.