A brand-new trial begins. The Ling'an Team, composed of Ye Lin, An Ke, He Zheng, and Huang Liang, is accidentally drawn into a team challenge with abruptly changing rules. Disconnected teammates, an unfamiliar city, and mysterious technology make successive clues harder to discern from the truth. Faced with strong opponents, Ye Lin relies on meticulous reasoning and teamwork with his partners to find a breakthrough, building trust with new companions along the way. When the chance for evacuation is right before his eyes, he resolutely returns to the perilous situation to fulfill a promise. However, the secrets of the biological mecha have only just been unveiled, and even greater puzzles still lie ahead.