Coiling Dragon (Pan Long) - Vol 1 Chapter 7: Coiling Dragon Ring (part 2)

Vincent Strider was a gun for hire who made a living by killing whoever it was his clients wanted dead. But during one mission, he died in a fierce gunfight. However, death was not the end for him. Vincent found himself reincarnated in another world, facing a floating interface that flickered before his eyes.[Synchronizing Host!][Military System initializing.]Vincent found out that in this system he received, he can summon soldiers, tanks, aircrafts, and even warships! This is going to be exhilarating.

Chen Lun traveled to the year before the game’s public beta and became an NPC in the game world.

And so, a new version was born…

Steampunk, spooky things, churches, shelters, the sequence paths of the seven righteous gods…

He put on his black top hat and stood on top of the ruins.

Standing behind him are the villain bosses of various versions in the previous life, the dead nun Floyd, the bloody painter Noah, the sword fighter Antonio, the delusional clown Alex…

Chen Lun: “Player spawns monsters, I spawn players, this is in the Taihe River…”

…

Also known as “Rational Use of This Sustainable Resource Named Players”, “These BOSS are really strong but they are all my younger brothers”, “No way! So I can also become a god? ! “

- Description from novelbuddy

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.

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates