I'm Catching Ghosts at the Police Station

My name is Lin Zhe. After graduating from the police academy, I encountered a bizarre murder case on my first day at work - the belly of a female corpse was hollowed out and strange runes were carved inside. I also saw a female ghost in a red dress in the autopsy room. Master Bo Ge took me to see the folk warlock Fourth Master. He said that it was the "Yin" formula. If all seven of them were gathered together, a certain seal would be unlocked, and the world would be in chaos. Soon a second corpse appeared, and the cause of death was actually caused by the "Three Nails to Destroy Soul" technique. But what I didn't expect was that a female ghost haunted me and even took up the body of my roommate Zhang Yifan, leaving some inexplicable clues. I was forced to be involved in this whirlpool of humans and ghosts, magic and conspiracy...