Ling Dong is an ordinary delivery boy. He travels through the streets and alleys of the city during the day, but at night he always encounters some unexplainable strange things. From the first time he delivered food in an old community, he found that the customer had been dead for many days, to the subsequent strange orders, addresses that disappeared out of thin air, and recurring customers... He gradually realized that he seemed to be involved in some kind of supernatural force. But as the investigation deepens, he discovers that behind the so-called ghosts, there are actually human hearts that are more terrifying than ghosts. When the layers of fog are cleared away, the truth is chilling - it turns out that the biggest mystery is the human heart.
