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?

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.