Superstar From Age 0 - Chapter 649:

Traveling through a parallel world, Ye Cheng planned to be a copywriter and copy tomb robbing novels, but he became a gold medal writer in one fell swoop.

But who would have imagined that, with the unearthed ancient tombs, Ye Cheng’s novels have become reality.

Numerous archaeological teams rushed to ask for advice.

As a result, as Ye Cheng solved more and more ancient tombs, he couldn’t explain it more and more!

…

- Description from novelbuddy

I lived for you in the last lifetime, everything I did was for you, yet you wanted me to die; so, this time, life is mine to live! This world lied to me, betrayed me, and humiliated me, and I am back to change everything!

- 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.

The cycle of life is not infinite—except, perhaps, for Elijah.At 122 years old, Elijah lived a long and successful life—until he woke up as someone entirely new. Now, an anomaly in a mysterious kingdom sustained by magic, he faces questions about his place in a world that doesn't defy the laws of nature, but take them to an entirely new level.For over six millennia, this isolated realm of 300,000 citizens has thrived, its survival bound to the magic that nurtures its air, water, and food. Yet, some whisper that a kingdom refusing to expand is doomed to fall. How, then, has this kingdom endured?As Elijah uncovers ancient secrets, dives into treacherous cave systems, and grapples with the fatal flaws of magic, he learns the truth about existence itself—forces that shaped the cosmos. New alliances rise to confront an ancient plague, and the kingdom's delicate balance teeters on the edge of collapse.In this world, the vibrant hues of freedom and potential are mere illusions, like sunlight filtered through stained glass. Elijah must decide whether to shatter the illusion—or embrace it.————This novel goes into great detail about the ways of the people and how it will differ from the suspected outside world. What seems like a population of people who do not have much knowledge, show how they found their way by “feeling”, or by anecdotal(personal) evidence.