Spies and Suspicions

Ning Cai, a good-for-nothing with super analytical ability, suddenly traveled back in time to the Republic of China and became an agent. In that era of chaos and strife, let's see how he gradually ascended to the throne of spy king and became the terrifying King of Hell. Since the law of heaven does not act, then I, Ning Cai, will become the law enforcer of the law of heaven, a shadow in the night.