Lin Yue, a retired special forces soldier, joins a live-streamed death-room escape challenge offering a prize of tens of billions to raise rehabilitation funds for his disabled comrade. Hiding his claustrophobia, he enters the competition disguised as a security guard. Facing teammates who look down on him, poisonous gas, quicksand, and deadly traps, he relies on risk alerts from a mysterious system called the Peril Lexicon and his combat experience to lead the team through each challenge. However, he discovers a deadly gambling scheme manipulating life and death behind the show. The mastermind bribes teammates, fabricates videos, and even sends mercenaries to hunt him down. Pushed to the brink, Lin Yue overcomes his fear and joins forces with his allies to expose the conspiracy and destroy the gambling operation. He wins the prize money and uncovers the truth behind his comrade's disability.