Global Demon King: Starting as the Abyssal Dragon - Chapter 362Vol. 2 - - Rat YaoGuais

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.

After picking up a phone on the streets, Feng Yuchen was sent to the world of High School of the Dead. He, along with 100 people, have to travel through various worlds, fight and solve quests in order to survive.

Whoever dies in that world, would be teleported back to the real world without memories of what happened before and die in an accident one year later.

- 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.

Every overbearing president will always have a coquettish, pure, or lively white moonlight in their hearts. They are the vicious female partners in the novel, the stepping stones of the heroine, and the tool to promote the feelings of the hero and heroine. In the end, because of jealousy, run-down and decay she became a coquettish bit*h that everyone hated. However, one day-after Su Luó , who is unreasonable, indifferent and calm came… the domineering president of every world would be desperate, heartbroken, and desperate to make a living. Love is like poison, making people crazy and go crazy..

- Description from Novelupdates