After a car accident, Li Luo loses everything and unexpectedly wakes up inside a mysterious, sealed building.
Building M: a bizarre structure filled with death and conspiracy, where every floor presents the ultimate test of intelligence, physical strength, and mental resilience. There are no rules here, only a cruel game of survival. Every participant carries a burden of past wrongdoing they cannot escape. Forced to struggle for survival in desperate circumstances, they face life-and-death choices and betrayals that lay bare human nature. As reality and the depths of human nature intertwine, a heart-pounding battle for survival is about to begin.