In a remote village, the brother of the girl Chen Zhaodi married a mysterious sister-in-law - she was born to love water, eat carrion, and took more than a dozen cold baths a day. Her brother claimed that she was a snail girl, and he turned her bath water into wine and sold it, which was highly sought after by the villagers. However, Chen Zhaodi gradually discovered that the truth was that her sister-in-law might not be a field snail, but a snail full of parasites; her brother even secretly planned to use her as a drug to lure her to death.