Lin Yu, the owner of a small shop, is worried about soaring rent. By chance, he finds a battered wooden box carved with strange patterns. The moment he opens it, an eerie fog engulfs the street.
A mysterious woman in ancient clothing leaves him clues about the fog, then disappears. Lin Yu finds himself being followed for no apparent reason, and a countdown appears.
After finally using a stone to dispel the fog, he finds himself in an unfamiliar place, facing two moons in the sky and a portrait of himself on the city wall. An even greater mystery awaits him.
