Chen Yu, who grew up with Grandpa Chumaxian, never thought that all the bizarre stories about his grandfather were true. His grandfather died mysteriously when he was out. On the first seven nights, a cold judge's pen pierced the palm of Chen Yu's hand. The blood was the contract and the yellow paper was the certificate - "Walking Yin and Yang, controlling life and death" eight bloody words, announcing the complete overturn of his destiny.
Forced to take over his grandfather's mantle, he faced a red-clothed ghost for the first time. On the thin line between life and death, a hole in the netherworld opened up, and the figure of his late grandfather stepped out. The words "This is my grandson, and he will perform official duties in the world" completely pushed him into the realm of yin and yang.
From then on, he was not only a little fairy in the human world, looking after things and relieving worries, but also a judge agent appointed by the underworld, solving sinister cases, interrogating ghosts, and quickly traveling between the two worlds. The truth behind his grandfather's death is shrouded in mystery, and undercurrents are surging under the underworld. Ancient grudges and dormant demons are gradually drawing him into a huge whirlpool.
Holding the judge's pen in hand and shouldering his grandfather's unfulfilled responsibilities, Chen Yu could only carve his own way in this world where humans and ghosts intertwined and gods and demons coexisted until he revealed the final secret.
