When deliveryman Huo Jin was delivering orders on a rainy night, he held a bronze key that could open the door to hell, and the whole city suddenly lost power. Mutations broke out, the undead paraded through the streets, and the living were dragged into the abyss. He is forced to become a living sacrifice that travels between Yin and Yang, and the only one who can see through his identity is the mysterious customer Ruan Yao who always places orders on time at midnight - a black marketeer who never shows up but accurately predicts every disaster. As Huo Jin's key gets hotter and hotter, Ruan Yao's order becomes more and more absurd: a corpse from seven days ago, a cry from the old well in the east of the city, and three drops of unshed hatred. Which of them is the real opener? Who is controlling this countdown to doomsday?
