Lin Wuyou, 25, is a designer at an internet company and a typical 996 wage slave. His life consists of three things: revising requirements, paying rent, and sending money to his parents back home.
Then he rescued a black cat with an injured hind leg outside his rental apartment. The next day, when a fire broke out at his company, the cat led him out of the flames. A month later, the cat returned and called him "nephew."
"I'm your uncle, your mom's older brother. Two things you need to know: First, yin energy has eaten away at your life, and you've only got three years left. Second, my soul is about to dissipate. Neither of us is in a position to be picky, so let's team up and extend our lives."
Wang Jibai passed him a book called The Book of Yin and Yang, which lets him communicate with the dead and understand ghost speech, helping departed souls fulfill their lingering wishes. Each time he resolves a ghost's unfinished business, he gets two rewards: his uncle takes sixty percent of the merit points to restore his golden body, while all the extra lifespan goes to Lin Wuyou, extending the three years he has left. Their roles are clearly defined: he works as an agent, running errands and handling cases, while his uncle serves as a technical consultant and sharp-tongued supervisor.
By day, he goes to work and puts up with his boss. At night, he crosses the city to help ghosts.