Dead on Mars - Chapter 109 - Sol Hundred and Twelve, Tomb Digger

An ordinary youth living in the year 2050 in the Western calendar accidentally came to a fantasy world created by the collision of magical elements and supernatural technology at the other end of the dimension…

- Description from novelbuddy

Yun Woo is the youngest author in history to enter the literature world. His debut work was a massive hit but this success was short lived for the unprepared.

A Lovecraft- inspired darker, grittier One piece fanfic. A fanfic based on emotion and madness. A fanfic not for the faint hearted.----------------Regret. I have been drowning in it for far too long. I’ve regretted every choice I’ve made, every mistake I’ve carried, every moment of my past. I’ve regretted the present I live, the path I walk. Even my future, uncertain as it may be, has been tainted by regret.But not anymore. I refuse to live under its shadow. Yet, I know the truth—I don’t have the power to escape it completely.Am I not like a flicker of flame? So fragile, so fleeting—one puff, and I’m gone.Regret has burdened me, weighed me down to make me climb the towering wall of greatness. But I press on.It was all I could do. All I ever wanted to do.

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.