The Mid-Game Shift: When the contestants realize that passive survival yields no additional time, 8th Floor, backed by 6th Floor’s physical force and 4th Floor’s opportunistic scheming, stages a bloodless coup. They hoard food and water on the top floor and subject Floors 1, 2, 3, and 5 to forced labor and cruel sleep-deprivation torture to keep the broadcast timer running indefinitely.
The Counter-Rebellion: With the covert help of Floor 5, the lower floors overpower the upper tier. 8th Floor and 6th Floor are bound, gagged, and neutralized. Rather than torturing them in kind, the lower floors seek a peaceful end to the game.
The Room Switch Deception: 1st Floor (Sang-guk) spends his accumulated 1 billion won on the courtyard intercom to purchase the "Room Exchange" option, believing he will swap places with Floor 8. Instead, the system delivers only an instruction manual revealing that transferring to Floor 8 costs an impossible 340 billion won. Driven to despair by the realization that upward mobility was a mathematical lie, 1st Floor snaps.
The Climax & Finale: 1st Floor ties up the other players at gunpoint and performs a dangerous high-wire circus tightrope routine across the courtyard to generate entertainment time. A tragic mishap sparks a fire, leaving him mortally burned. To save him before he succumbs inside the arena, Jin-su shoots and destroys all surveillance cameras, deliberately ending the show to force the exit doors open.
Epilogue: Sang-guk dies from his injuries shortly after exiting. Jin-su organizes a funeral for Floor 1; only the lower-floor survivors (Floors 2, 3, 4, 5) attend. A floral wreath is sent by 6th Floor, showing silent remorse. It is revealed that 8th Floor spent her remaining fortune destroying an art gallery and was jailed. In a post-credits scene, 7th Floor (Phillip) pitches the traumatic experience as a television script to a wealthy executive, who remarks that the concept is so engaging it might warrant a "Season 2," highlighting how human agony is inevitably absorbed back into the media machinery.