The year Zhou Jin burned paper for the dead, before the ashes were cold, the living people would kneel down when they saw him and call him "ancestor". He didn't know that his bloodline had long been branded by the underworld, and every time he burned a piece of yellow paper, it would save the soul of the dead. Until that night, Yu Zhao came walking on the blood moon, holding a bronze bell in his hand, laughing at his life as thin as paper: "What you burn is paper, and what you spend is life, and I am here to collect the debt." From then on, he paid off debts for ghosts, and she demanded lives for people. The worlds of Yin and Yang were disrupted by this strange couple - he burned paper into ashes, and she took her orders as a blade. No one knew that what was burned in the ashes was their unfinished blood oath in the previous life.