Milf Hunter in Another World - Chapter 324: Moans Can Be Heard From the Next Room.

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

Lin Feng was reborn and returned to the day of the “Destiny Continent” public beta!

In order to control his own destiny, Lin Feng resolutely entered the game!

But after he just logged into the game, he was suddenly bound to the 10,000-fold increase system!

“Ding dong~ You triggered the 10,000-fold increase and successfully obtained the SSS-level talent [Unlimited Firepower (Unique)]!!!”

“Ding dong~ You have triggered a ten thousand-fold increase and successfully obtained the forbidden spell [The Scroll of Destruction Codex (Mythical Grade)]!!!”

“Ding dong~ You triggered the 10,000-fold increase and successfully obtained the buff [Permanent Invincibility]!!!”

Hostile player: “Report, this is forcing you to hang up!”

- Description from novelbuddy

This is the story of a young slave gladiator in an underground arena. He doesn’t know about his past or how he got to where he is, only that his name is Aegir, and that he is strong.