After the Gray Fog: Grinding for Experience in the Psychiatric Hospital

In 2030, five years ago, Earth was engulfed by an unidentified gray fog. Afterward, many people began suffering from a range of problems, including dizziness, fatigue, and hallucinations. They proved difficult to treat, until a final diagnosis labeled them a new type of mental illness.

Jiang Han was one of them, but unlike the others, he encountered many bizarre events. These turned into a bizarre world where he could grind experience and grow stronger.