Xie Jin, the judge of the Yin Division, was ordered to seize the soul, but when he was about to lock his life, he discovered that the soul was actually an old friend he killed three hundred years ago - Gu Yao. Her soul persisted, and she was reborn against the will of heaven, and returned to the world with a ghost blade that could cut off the laws of darkness. When the golden plaque of the Palace of Hell was split by her sword and the underworld boiled, Xie Jin realized that killing her back then was a trap set by heaven. Now she is tearing apart the iron law of the underworld and asking him to overthrow this cannibalistic order with his own hands. He holds the knife, and she holds the blade. One for revenge, the other for redemption. They go through the eighteen levels of hell together and reverse this man-eating fate.
