The Idle System

The Idle System is a LitRPG series following John, who transmigrates to a new world seeking immortality and power. He is quickly deceived and tasked with missions against his will, making enemies of an entire kingdom.

He then joins an Assassin’s sect, where discord arises due to mind control, forcing him to confront his own allies. Alongside another "Sider" named Sarah, John faces new enemies obsessed over her, while mastering a "Sinner System" tied to his morally ambiguous path towards revenge and defending what he holds dear.

Later, Sarah's perspective takes center stage as she shares her medical knowledge with the Sword sect potentially unleashing dangerous secrets. John is then drawn into an eons-long war against Beastmen, where humanity faces defeat, forcing him to choose between aiding them and paying for his past actions.