Apocalypse Secret Realm: Only I Know History, and Can Save China

Secret realms from around the world fused with Blue Star. Natural disasters struck one after another, territories shrank drastically, and China missed out on the opportunities within the secret realms because of gaps in its history, causing its national strength to plummet. Only the transmigrator Duan Chen knows the complete history. He ventures through secret realms from the age of myth and the Three Kingdoms, wielding history like a blade to hold up the mountains and rivers of the Nine Provinces as they teeter on the brink of collapse.