So-jin, Dong-hyeok, and Hye-rin are each trapped in a narrow mortuary cabinet.
Without knowing why they're locked up, and feeling horrified to the core, they try to make sense of what happened by introducing themselves and through discussion, but fail to find anything in common.
Time passes, and Hyerin's phone rings as they start to find hope in their tragic situation.
Will they be able to escpae this place?