As a detective, Cheng Zhen received an unsigned letter after the investigation one day, inviting him to a mysterious party called "The Soul Party."
What kind of party is this? Who organized it? What kind of secret is hidden behind it? Cheng Zhen knew nothing.
In order to explore all this, Cheng Zhen set off the next night according to the address indicated on the letter.
But he seemed to have met a strange person...
Purpose: Reveal the secret