A sudden and huge earthquake trapped five strangers in the underground ruins of the city. In an extreme environment where oxygen, food, and water are extremely scarce and rescue is out of reach, they have to work together across the board. The team tested each other, divided work and cooperated with each other through humor and complaints, and solved a series of life-and-death crises. This journey is full of dangers. They skillfully use their wisdom and combine psychological and physical strength to gradually break through the siege and calmly face the secrets and fears deep in their hearts. Everyone moved from distrust of each other and anger at the world to appreciation, tolerance, and unity, and ultimately achieved their own growth and self-worth. When they finally escape, they redefine their "meaning" to each other and themselves.
