Papermaker Su Jiuniang was accidentally involved in the underworld and became a sinister agent. She was forced to partner with the cold-faced judge Shen Mohan to handle human underworld cases. She used traditional paper-making skills to decipher supernatural events and uncover a millennium conspiracy in the underworld. She eventually counterattacked and became a law enforcer of the Six Paths, falling in love with the judge within the laws of yin and yang.
