Married to the Male Lead's Brother - Chapter 95:

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

[You have become the master of the Warden Mansion.][Your first quest is to refine mana from one of your maids by having intercourse with her.]When nineteen-year-old Jett Talon suddenly wakes on an emperor-sized bed, he finds himself lord of a mysterious mansion where countless gorgeous maids stand ready to serve. His first companion is Mia, a blonde elven maid who checks his every box. After making love to her, Jett gains mana, unlocks legendary powers, learns his duties as Master of the Warden Mansion, and uncovers its hidden secrets.

In a zombie apocalypse world, Earth has become a place inhabited by people with twisted hearts. In a dog eats dog world, she struggled to survive and witnessed the deaths of love ones until she met her own gruesome death.

But she was reborn, she was back to the beginning of the end. She held a divine sword: meet a god, kill a god; meet Buddha, kill Buddha! Regardless of which methods, she will use anything in her disposal in order to protect her loved ones!

He is gentle as jade, just like his name. Despite his extremely poor shooting skills, he can make powerful people follow him faithfully. He has an army in his hand, and his power shakes the world.

They are two people who have never met in the previous life, yet their paths kept intertwining in this life. Is it fate? No, for Bai Ling, maybe it’s an evil one!

- Description from Novelupdates

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.