One Disciple, One Realm; I'm Invincible at Three

[System, No Female Lead, So Satisfying!!!] That year, the peerless Prince of Zhennan led a campaign against the Northern Wastes and vanished without a trace. The Prince of Zhennan's residence rapidly fell into decline. Lu Chen inherited the title of Prince of Zhennan. Facing internal and external threats, he held them all at bay! Top-tier martial arts and world-shaking techniques were his at the touch of a finger. That year, the Great Zhou Emperor was old and near death, and his princes fought for the throne. Lu Chen became a prince's tutor and entered the Grandmaster realm. He became the Emperor's mentor, cut down his rivals, attained the realm of the Earthly Immortal, and saved the empire from collapse! That year… That year… Lu Chen was three years old! … The blurb doesn't do it justice. In short, this is the story of a three-year-old toddler…