Mr Gu's First Doting Marriage - Chapter 4 - : The Birthday Gift is Catching Cheating in the Bed

The world has changed, and so have the people.

Sherlock is a new generation Dungeon Lord whose ambition is to become the greatest Devil King and building up the greatest Dungeon in the Underworld.

He summons a group of other-worldly goblins who give themselves strange names, form cliques, engage in commerce, and even fight among themselves.

They call themselves—Gamers!

- Description from Novelupdates

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.