Ling Yu woke up to discover that she was dead. After getting into all sorts of trouble in the underworld with the Black and White Impermanence, she ultimately forgot to drink Meng Po's Soup and was reincarnated directly as the kitten she had raised, while the kitten's real soul was imprisoned in the underworld. If she couldn't find twelve other people like herself who had forgotten to drink the soup, the kitten's soul would be scattered forever. As she searched, Ling Yu possessed a female college student who looked just like her, while Chu Xun, an undercover police officer, helped and supported her. Before long, they discovered that the search for those who had forgotten to drink the soup was part of a vast conspiracy involving the realms of humans, ghosts, and gods.