The Deliveryman Solves the Case with All His Skills from the Underworld

Delivery boy Xu Lai travels to parallel time and space. In order to complete system tasks, marry Zhang Jiaqi and return to the original world to inherit tens of billions of assets, he accidentally awakens the god-level detective system and acquires a series of "underworld skills" such as painter, lock picking, god of gambling, deception, and disguise. He relied on these skills to undercover counterfeit banknote gangs, detect wife murder cases, sweep underground casinos, solve bombing cases, destroy fraud gangs and large drug trafficking syndicates, repeatedly solving strange cases along the way, counterattack from a rejected deliveryman to a detective, and finally succeeded in winning Zhang Jiaqi's heart and successfully completed the system's tasks.