Su Chen awakens ten years before a catastrophic alien invasion that nearly wiped out humanity. Armed with the knowledge of his previous life and a mysterious Myriad Worlds Traversal System, he resolves to change the future. The system allows him to travel to countless realms, but each journey costs a hundred days in that world for only one day on his home planet, Blue Star.

Using this limitation, Su Chen plans to gather cultivation resources, ancient techniques, and powerful artifacts from other worlds to strengthen humanity before the extraterrestrial onslaught begins. While navigating school life, family bonds, and the rising tension of an imminent war, he secretly cultivates, recruits allies, and schemes to overturn the fate that doomed his previous timeline. As spiritual qi begins to revive and cultivators emerge, Su Chen balances his role as a diligent student with his hidden mission to become the savior who leads the resurgence of spiritual energy and protects those he loves.