In the instant of the car accident, life came to an abrupt end, and the protagonist entered the legendary "Netherworld." There, he encountered "Bai Wuchang," a death emissary who governs life and death across yin and yang.

However, death was not the end. Over the years, driven by his unyielding determination, the protagonist himself became a "Wuchang" in the Netherworld, traversing between life and death and fulfilling the role of guiding souls. One day, he was shocked to see his sister's soul—her flame of life had grown faint, on the verge of extinguishing. Faced with this cruel reality, the protagonist could not accept his sister's life ending so easily. He resolved to challenge the rules of the Netherworld, doing everything in his power to protect her and strive to extend her life.