MTL - Comprehensive Manga: a Journey Through the Supreme Being - Chapter 160

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.

Ye Qingli is the daughter of an Imperial Businessman’s first wife, wealthy and overbearing. But because of her mother’s early funeral, she suffered utter oppression and abuse under the hands of her stepmother. On the eve of her marriage, she died tragically in the hands of her stepsister and her own fiance!

He is an overbearing, tyrannical, cold-hearted, demonic king. Grim and ruthless, only restrained by his wife and son!

Once reborn, the weak daughter transfigured into a Divine Genius Healer. There was no intersection between the two people, yet they were bestowed a paper of marriage!

Subdue and kill the Seven Wives?

Very well. This daughter also wants to kill her evil, wicked stepmother and stepsisters! Do you still dare marry me?

However, the Handsome Prince and the Divine Genius Doctor, how do you get them together?

Ye Qingli touched her chin: “So many people, which one do I choose?”

A furious royal highness: “Herald, continue dispatching orders. Whichever male creature dares get within three feet of the royal consort, kill him immediately!

- Description from Novelupdates

At 18, Alex Kain is whisked away to Eryndor, a game-like realm where he gains 'Skill Synthesis', a talent to fuse skills into godlike powers. Battling monsters and conquering dungeons, he builds a harem of strong women drawn to his might and charm. With the power to return to Earth bearing incredible resources, Alex faces a growing threat that endangers both worlds in this epic of adventure, romance, and ambition.

[You have entered the dungeon at Gwachun Station’s 1st Exit.] When former high school student Kang Woojin finds himself returned back to Earth after being forcibly summoned to a foreign planet for 20 years, he soon finds that Earth is not the same, normal place as he once remembered it to be.