One day in a modern city, a sudden gray fog enveloped the entire city, and many people disappeared mysteriously. Su Bei, an ordinary migrant worker, was dragged into a different world called "City of Gray Fog" in an accident. He discovered that this is a contract world full of crises and rules. Everyone is assigned different tasks. Only by completing the tasks can they survive. Failure means being swallowed by the gray mist, and even the soul cannot escape. The City of Gray Mist not only hides unknown monsters, but also cold-blooded hunters and guides who are proficient in the rules. In order to survive, Su Bei had to face all kinds of incredible challenges and uncover the truth behind the Gray Mist City. However, as time passed, he gradually discovered that the controller of this game was actually closely related to his past. The gears of fate began to turn, and Su Bei gradually grew from an ordinary person to a strong man who controlled the rules. At the junction of gray fog and reality, can he find the truth about the "heart", save himself, or even change the fate of the entire world? This is a story about survival, growth and struggle against fate. At the end of the gray fog, is it light or an abyss?
