Unlimited Game Upgrades

Chen Jianqiu picked up a white card, which gave him a system that can infinitely improve his level. He can complete tasks based on supernatural events and travel between two worlds. Use the supernatural to fight ghosts in the real world and the dark world at the same time, break the rules, upgrade, join the investigation bureau and gradually gain real power. The swansong of the supernatural era, corpses buried in fluctuations, ghosts that keep emerging... Terror, despair, this era is falling into destruction. How should Chen Jianqiu choose his own position?