MTL - First Evolution - ~ Recently, a lot of friends are asking me a question, I must answer it carefully ...

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

Transform into Divine Dragon and dominate the world!
He is the only Divine Dragon in the sea who founded an underwater Dragon Palace.
With Crawfish Soldiers and Crab Generals as his followers, wild sharks and gigantic octopuses as his subordinates, he is the dragon that rules the city.

- Description from Novelupdates

The Ancient Fiend Dragon Emperor, Su Han, had once governed the holy realm and held sway for a whole century as the most powerful man of the entire galaxy!However, after his death from berserk Qi deviation due to merging different cultivation levels, his men mutinied, his lover fell into a deep sleep, and his best friend became a fugitive!Now, after being reincarnated, Su Han will surely make a comeback and turn things around, killing everyone that had once betrayed him!!!

A Hentai World is a Dangerous Place, Especially if Your Best Friend is a Hentai Protagonist and You Are a Trap.