Global Reincarnation: Only I Know the Plot - Chapter 3:

At the moment when he was about to be buried alive by the villagers, he blew himself up… no, he saved himself successfully.

He just wants to live and die in this era, but… that woman is too crazy.

…

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- Description from novelbuddy

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.

High society CEO Big BOSS Lu expresses that he’s felt stifled recently. Ever since a woof style creature intruded upon his home, his life has become a complete mess. A slight conflict in opinion and his couch is hijacked, his desk seized, his lap forcefully occupied, even his bed was forcefully dominated!

The small Sammy, with his head resting upon his waste removal official’s thigh and four paws facing the sky exposing a soft little belly, with a face full of untainted purity and a pair of innocent eyes: “Woof~”

Big BOSS Lu lowers his head and makes eye contact for three seconds : “…. Give give give! Whatever you want, I will give it to you!”

- Description from Novelupdates

【Hilarious and Adorable Novel】As a military doctor with expertise in both Chinese and Western medicine, Gu Changsheng felt that this time-traveling journey was ridiculously screwy!Once he traveled back, he was gifted a son, hmm, it felt quite nice.Having a son to rely on in old age, plus owning a steady estate, wealth and glory weren't hard to come by.A lousy father turns over a new leaf? Sorry, mom here isn't fond of revisiting the past!Son, what kind of dad do you want? From the multitude of handsome and wealthy young men out there, let’s pick and choose…This is the story of a bizarrely outstanding female doctor, strutting through ancient times with her child in tow!