Guo Jin transmigrates into a mash-up of Hong Kong crime dramas set in the 1980s, becoming a plainclothes officer in West Kowloon's Major Crimes Unit, demoted to watching a reservoir for offending his superior. This is a place where all sorts of people mix: gang wars, cops and criminals working together, and secret feuds among the wealthy are everywhere. More dangerously, some powerful figures who can make things happen with a word are no longer human. Parasites from the planet Tianwu are quietly replacing Hong Kong's elite and most ruthless figures.
Guo Jin is framed in a dismemberment case at the docks. On the brink of death, he activates the Startrace Hunting System, which can scan for, lock onto, and hunt all intelligent lifeforms that aren't from Earth. Killing them lets him absorb stellar essence to strengthen his body and reflexes. With the System and his past-life experience in criminal investigations, he turns the tables on his assailants and exposes a corner of the mole network within the police force.
As his investigation deepens, Guo Jin discovers that these extraterrestrial parasites are even more ruthless and cunning than the people they've replaced. They are using the gangs, corporations, and police force to weave a hidden web that will swallow the whole city. He decides to advance cautiously and ruthlessly: cut down one, absorb one, and make everyone and everything standing in his way disappear. And as for Shen Yi, the medical examiner who keeps opposing him at the autopsy table, he has no intention of leaving her within anyone else's reach.
