Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 8 Chapter 1

Gripes have their origins and debts have their creditors. We haven’t crossed each other in days past or present, nor formed any grudges. I am but duty-bound to carry this out, so apologies in advance!

In his past life, Yang Chen was a gentle person who was oppressed for his whole life.

Now that he’s reborn, he chose to become an executioner and severs ties and grudges with his executioner’s blade, killing all that climb onto the Immortal Executioner’s Platform!

Heads will roll! Humans’ in the human realm, demons’ in the demon realm, devils’ in the devil realm and immortals’ in the immortal realm!

- 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.

Su Qin crosses into a world where martial artists run rampant, where Buddhist monks from the Yuan Dynasty dominate the world. Jiuyang’s successor’s fist conquered the mountains and rivers, and Xiao Li’s flying knife smashed through the void.

Because Su Qin had no martial arts qualifications, he could only become a sweeping monk in the Shaolin Temple. At this time, the ‘Sign In System’ was activated.

Sign In in front of Buddha’s Golden Body, get [Buddha’s Palm].

Sign In in front of the Arhat Hall, get [Invincible Vajra Divine Art].

Sign in at the back mountain of Shaolin Temple, get [Golden Demon Body].

The Shaolin Temple was riddled with treasures, and you can sign in everywhere.

Su Qin decided that he would never leave the mountain without Signing In to everything in the Shaolin Temple. And so, he Signed In the Shaolin Temple for twenty whole years!

Twenty years later, the Shaolin Temple got mixed in the battle between the Righteous and Evil.

The Demons were fierce and powerful, they blatantly invaded the Shaolin Temple and were pushing forth with great force, but that is until they met Su Qin who was sweeping the floor…

Transmigrating to a lawless person and then directly upgrading to a little brat’s stepmother. Xiao Ting said, “Crap, there’s no need to even give birth to a child. God, I love you so much …”

- Description from Novelupdates