MTL - My Hero Academia: My Personality is the World - Chapter 214

“The civilians here are not simple, they are cunning, they are greedy, they are tyrannical.”

“The nobles here are not noble, they are selfish, they are arrogant, they are insidious.”

“I used to be angry about this, but now I pity them. This is a dark world. Since they were born, they have not had the opportunity to choose another life. Now it is up to me to give them.”

“I will bring food and clothing to them, and then they will have morality. I will bring comfort to them, and then they will have faith. I am a traveler from a distant world, and I will bring the fire of civilization to In this dark and wild place, I know I am doing the right thing, eradicating famine, driving out disease, suppressing crime, ending war, and giving anyone who wants a change a second chance.”

“Then, kill all those idiots who are shameless.”

- Description from novelbuddy

A piece of divorce paper sent Xia Xinghe into a state of destitution. However, a car accident later, she transformed into a professional hacker with more money than she could ever spend. All those that have belittled, bullied and laughed at me, please line up, I’ll show you what the meaning of face-slapping is! Wait, wait, wait. That guy over there, the ex-husband that I no longer have any relations with, don’t cut in line. What, you want to help me face-slap these people? “Not only that I will help you face-slap myself!” The wickedly handsome man with billions of dollar in estate raised his own palm to slap his own face without reservation!

- 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.

Hell Ghost Wang Wannian is born again, smiling and proud!
What?
Are you a soldier, will the tank drift?
You are a master, can you give birth to dragons and tigers?
You are a superman, can you call the wind thunder?
Excuse me, I am not targeting anyone, everyone in my eyes, it is rubbish!

- Description from Uukanshu (translated)