Global Reincarnation: Only I Know the Plot - Chapter 12:

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.

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

- Description from Novelupdates

Xu Mo, a modern high school student was sent back in time to Jing Kingdom and found herself trapped inside of the body of a princess with the same name.

She had barely recovered when she learned of an unparalleled fiancé and in a daze, they got married. Then the stunning genius physician who normally does not pay attention clamoured to marry her. After that, there was a cold general, a flirtatious lord, a tsundere young master……

As it turns out, this was a male-dominated dynasty. Because the female population was sparse, the entire nation shared wives regardless of rank or nobility. Is it feasible for someone who wants to maintain monogamy in this dynasty?

- Description from Novelupdates

There is no rebirth through time, and there is no system of heaven to cut melons and vegetables;

There is no secret book under the cliff, and there is no great return pill from the dead;

There is no such thing as a full-fledged lust with a strange root and a sacred blood.

If it is said that Shi Jianren is an expert who has attained the Tao and joined the WTO,

Then Bai Haonan was a dazed fellow who smashed his head into blood.

The key is that he still feels that he is living a very happy life!

A story similar to the golden right foot,

A story about a dream,

It depends on what tinted glasses you are wearing.

- Description from novelbuddy