Lin Jue, a logical and rigorous brainiac, accidentally fell into an infinite survival game called "Echo". The game started in hell mode. His life was hanging by a thread in an abandoned hospital, and he was easily rescued by Lu Chen, who was extremely powerful but cold as ice. Before they could say thank you, the two were forcibly bound by the system into a "symbiosis contract" - sharing their lives, one prospered and both prospered, and one died and both perished. In order to survive, the rational and calm "strategist" and the decisive "force" were forced to form a team. From distrusting each other to sharing life and death, they worked together in the strange dungeon to uncover the shocking mysteries one after another, and also uncovered the even more astonishing secrets behind the "Echo".
