There is always fog in the foggy city at night, and there are always stories.
Detective Shen Yan does not believe in ghosts and gods, but in a murder case that matches the legend, he meets Lu Ci, a radio host who can see "another world". The mass disappearance ten years ago, the ancient copper key, the shadow ghost in the theater, the "heart of the door" in the clock tower - the truth and fear are approaching together.
They traveled through life and death side by side, becoming each other's only light at the boundary between the fog and the door.
When the "door" opens again, they must choose: to defend Fog City, or to defend each other.
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This is a suspenseful and supernatural story about fate, trust and love.
What awaits them on the other side of the door is not just the truth.
Concept: At the boundary between fog and door, love is the only light.
