Dragons, sky demons, zombies, and immortality. Mo Chuan is a Taoist priest who lives on the mountainside with his sect. One day, he accidentally undoes the seal on a sky demon from the Qing Dynasty?! Now, this is no ordinary sky demon. It can bring about calamities and plagues the likes of which the world has never seen. The only thing that can help restrict its actions? A blood pact that binds the fates of the two together for all time. Will it blossom into romance? Or till death do they part?

Kate is a detective who investigates monsters. He lives in a weird city - A robot's smile creeping in the darkness of a laboratory, a mysterious shadow appearing on the balcony, a blackhole that tears open the space around the corner of a street... Seeing more and more these weird phenomenons appearing, people were on the verge of madness, yet only detective Kate is enjoying the adventure.

An artist who has a split personality and a policeman were oddly paired up to solve strange cases. As the two solve anomalous occurrences, they slowly know the truth of the disaster twenty years ago.