Transmigration: Reborn as a Tomb Keeper, I Awaken the System

The protagonist, Zhang Wei, transmigrates to the Great Yan Dynasty and becomes a guardian of the imperial tombs. He expects to spend the rest of his life in peace, but unexpectedly activates a sign-in System. By signing in before different imperial tombs, including the Mausoleum of the Yellow Emperor and the Mausoleum of the Flame Emperor, he can receive generous rewards such as the Yellow Emperor's True Scripture and the Nine-Turn Heaven-Incinerating Flame. Zhang Wei sticks to the principle of keeping a low profile while steadily building his strength, signing in at the imperial tombs for sixty years. Then he heads to a new continent!