Akuyaku Reijou ni Nanka Narimasen. Watashi wa『Futsuu』no Koushaku Reijou desu! - Chapter 178.1: The first act in the morning.

My name is Jiang Li, and upon traversing to this realm, I found no golden opportunities waiting for me. Through sheer effort, I cultivated my way up to the Great Completion Stage. Now, suddenly, a system appears, claiming it can help me turn the tables and transform me from a minor Qi Cultivation phase practitioner into the foremost figure in the cultivation world.

Dear system, you're a bit late to the party. I, Jiang Li, already stand as the Emperor of our era, revered across the nine provinces. I am already the number one in the Cultivation World.

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- Description from novelbuddy

Kai of the Sorcerer’s Tower is one of the last mages left, barely surviving in a world ruled by creatures of the dark — where the era of mages ended, and most of the lands got contaminated with dead mana. To save his world and fulfil his master’s last wish, he put himself through a forbidden ritual, risking his soul being ripped into pieces to make his way into the past. In an era with abundant mana — an era yet to enter the Golden Era of Magic. Things go wrong, of course, as they always do, and he finds himself thousands of years before the world fell to mana contamination — in the body of a young lord, Arzan. All is not well, though, as the young lord was murdered by someone right at the cusp of a beast wave threatening the territory, while larger threats loom on the horizon. There was a lot to do for Kai to regain his former strength in this time of primitive technology, but then again, he might just be able to change that.