A strange nine-star continuum caused architect Sheng Jingyu and folklorist Li Ruoxi to be involved in the turbulence of time and space and travel to the eerie ghost realm of the underworld. This place is filled with miasma, evil spirits are rampant, and it is filled with mysterious laws that no one knows about. Sheng Jingyu relies on his calm and meticulous thinking and excellent survival ability to avoid danger time and time again; Li Ruoxi uses her unique understanding of folk taboos to solve the hidden mysteries of the underworld. The two went from being unfamiliar with each other to becoming dependent on each other for life and death, and they were struggling to move forward on a sinister road full of murderous intentions. They not only have to fight against the attacks of evil spirits and human scheming, but also look for opportunities to break the barrier between Yin and Yang. But the deeper they dig, the more they discover that this time travel is not an accident, but involves a cause and effect that spans thousands of years. At the end of the Yin Road, there is a shocking secret that can subvert the two worlds.
