MTL - Martial King’s Retired Life - ~ Illustration of non-real little teacher

A wonder falling down from heaven! A boy possessed by strange blood! Gods tremble! Demons flee! A boy from the land of Dong Zhou. A pink skull as his sworn friend until death. A story of a determined warrior struggling for power. A legend that shakes the galaxy and disturbs the worlds of god, demon and man.

- Description from Novelupdates

If the Red Dragon's head could pour out half a skull's worth of magma, the world would then witness the rise of the most enlightened monarch—the Red Dragon Book.David closed the book, a puff of Dragon Breath turned it to ash, and he whipped himself up a bottle of Fiendfire Elixir.To hell with bloody rationality.I just want to do as I please!This is the story of a Red Dragon rampaging through an alternate world, constantly rewarding itself by embodying the Seven Deadly Sins.

Wang Yi gets a key, opening a door in 2022 will lead to 1982, and opening a door in 1982 will return to 2022.

Two very different great eras appeared before him:

Abundant dietary protection, developed industrial products, miraculous medicines, and explosive information, this is 2022.

Simple folk customs, rich wild resources, scattered antiques, and treasures of the age, this is 1982.

Traveling between these two eras, Wang Yi didn’t think much of it, he just wanted to live a good life.

- Description from novelbuddy

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.