The Last Ghost in the Underworld

In a yin year, a yin month, a yin day, a yin time, in a world full of ghosts, a cry resounded in a coffin shop, and a child with a yin spoon in his mouth was born. Eighteen years of growing up that were incompatible with the people around him made Liu Yin's memory clearer. He suddenly recalled that he was a sinister man from the underworld, but he turned into a human for some unknown reason. So, he looked at the world around him where ghosts were causing chaos, and he couldn't help but wonder. "Why didn't my colleagues in the underworld arrest them? Is there something wrong? I have to investigate."