The Nine Profound True Realms

[Deduction System, decisive and ruthless, antagonists aren’t dumbed down]

Lu Chen transmigrates into another world and becomes a low-ranking civilian constable. By chance, he stumbles onto a case involving his immediate superior. Using his wits, he struggles to survive amid the power plays of major forces. His System can only assist with deductions, and those require energy. He is penniless and weak, but he fights his way up step by step to the very top.