Eternal Heart - Chapter 21: Honghu Three Killers

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.

He is the Lord of the Realm, he is the Supreme of the Realm, and the Celestial Buddhas are the ministers.

After the fall of the earth …

Fan Ruoxi : Feng Chen, people should hug …
Chen Ruolin : Feng Chen, everyone wants to kiss …
Liu Ruyan : Seal the dust, hurry up and roll over the aging mother, the aging mother must hold up
Li Bingbing : Shao Feng, his mother’s waist is sore, others have to rub
Feng Chen : It’s called Mao. Can’t come one by one?

- Description from 69shu

Civilization is destroyed and records lost. Only Dudian survives in a cryogenic sleep. Three hundred years later, Dudian wakes up and must become Dean to survive. Who can he trust in this world overrun by monsters without and within?

- Description from Novelupdates

Another entry in what you can call the Proto Harem Series: the books written before the Harem Series that take place in the same world.

It’s about a swordswoman whose student is captured, so she goes to rescue her.