The Yu Brother's Case Book - Volume 1 Chapter 5.2

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

When he heard the immortal sister from heaven had died, Fang Ren didn't really care.When he heard he was going on a blind date, Fang Ren was a bit concerned.When he heard his wife-to-be was the deceased sister from heaven, Fang Ren cared a lot!

An otaku with a hobby of masturbating was reincarnated as the son of a great mage.

As soon as he was born in this life, he vowed with a goal of embracing women till his death.

That said, when he became 20 years old, the Demon Lord which was sealed by his ancestors revived, and now it is his role to seal it once again.

And that demon lord is sealed in a tower dungeon that is rumored to be impossible to capture.

However, by an unexpected coincidence, he had found out that the Demon Lord is also one of him, a kindred spirit from within,

so he joined her instead and filled several traps in the tower dungeon, and thus they enjoyed a s*x spree with all the women coming over!

※ This book contains coercive relationships and violent scenes. Please be aware before proceeding.※ The names, locations, and characters mentioned in this book are entirely fictional.The calculation method of gamblers is truly peculiar.They lend money at exorbitant interest rates to those who haven’t even spent any money as collateral.For 15 years, Hongju has been collecting debts from housemates while being tied to collateral.One day, a man appears, claiming he will invest in the house.A rich fool, a money tree.The housemates called him Mookyung.“As long as you do as I say, I’ll help you.”Mookyung makes a suspicious proposal, offering to repay the debts in exchange for house information.Why would he make such a proposal to a debtor who is already struggling?Still, there is suspicion about him…“Do you think I’m a swindler right now?”“No.”“You shouldn’t. It’s all too obvious. Swindlers can tell just by looking.”Hongju has no choice but to accept that proposal.Growing up on scraps, he knows exactly where to stretch his legs.