MTL - Peach Blossom - Chapter 17

Three years ago, Yun Qing Yan fell into the Immortal Realm from the mortal realm. Three thousand years later, he became Divine Emperor Yun who shook the entire Immoral Realm. Breaking through the void and returning back to the mortal realm, Yun Qing Yan discovered that only three years’ time had passed here. “In the past, I did not possess the power to protect the people I hold dear. Now, I want the entire world to grovel at my feet.”

- Description from Novelupdates

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

[You have transmigrated, named Gu Sheng, and are a farm boy.][This is a dynasty in chaos, where demons and monsters lurk and bandits run rampant; as someone at the bottom, you face hellish survival difficulties.][You decide to lay low.][You awaken a mastery panel.][You breathe a sigh of relief, you can start grinding.][You grind Chopping Wood to Perfect, chopping bones and breaking tendons with ease.][You grind archery to Perfect, becoming a godlike archer who can hit a louse at a hundred paces.][You learn the Iron Stone Fist, set foot on the path of a Martial Artist, and grind it to Perfect, with punches as heavy as a million pounds.]……[You learn the Longevity Eternal Youth True Art, greatly extending your lifespan, giving you more time to grind, and greater hope to lay low.]……[You grind to the limit, steadily laying low, and one day you suddenly realize, you are invincible.]

When he woke up, Zhou Yi became the jailer of the Heavenly Prison.

Fortunately, the fruit of longevity, but there is no way to protect the Tao!

In the chaotic world of the Xiuxian world, monsters and monsters are rampant, and there are many dangers. Zhou Yi decided to hide and practice for hundreds of thousands of years!

The situation is changing, time is passing.

The child who was let go a hundred years ago became the founder of the country.

The young man who was instructed a thousand years ago became the Supreme Elder of the Immortal Sect.

The pet that was raised 10,000 years ago has become an exotic and peerless demon king.

This is the story of a mortal who is immortal, sitting and watching the vicissitudes of life, the change of brokerage, and finally becoming the immortal god of immortality!

- Description from novelbuddy