The cast of this drama are varied and interesting. The fantasy is that the majority of main leads are either from heaven (deities) or demons. mix in some humans and ghosts and then the plot takes off at a gallop.
There are other sub plots, a snappy bromance, a slow burn romance, a fairy sharing her brothers body in a male female swap, an idol who is actually a demon pig who falls for a zombie and let's not forget the black dragon that could disrupt the world unless the FL sacrifices herself.
It is a fun mish mash of ideas held together by the cunning and charming monkey Son Oh Gong played marvellously br Lee Seung Gi. His romantic feelings for Jin Seon Mi / Sam Jang are triggered by a magic bracelet that binds his heart and weakens him. There are many manipulations that often backfire and evil doers flourish but not too scarily.
I didn't warm too quickly to the FL until the zombie is taken over by an evil spirit who then manages to swap souls with the FL. The transition from a fairly staid person working as a real estate agent into a femme fatal was an eye opener. She transformed her body language and voice and was very believably a dangerous evil woman.

20 episodes packed with plots, back story, great visuals and sometimes weird CGI meant I was never bored and the OST is lovely too.