Extreme high-temperature disasters strike, and a high-rise building is accidentally sealed, trapping seven women inside. As water and food gradually run out, there are no exotic beasts or monsters outside; all crises stem from human nature tested under resource scarcity. The seven people, who initially banded together briefly, see their ideological differences amplify under survival pressure, pulling against each other's positions and testing one another, repeatedly facing difficult choices. Through 30 layers of twists and turns, in the desperate situation of the closed building, watch how everyone struggles to weigh between the bottom line of survival and inner conscience, completing a closed-loop story about human choices.