The Wrong Way to Use Healing Magic - Chapter 25Vol 13.

Existence was divided into three realms. The Heavenly Realm. The Earthen Realm. The Infernal Realm. Below them, countless minor realms of all types existed, none able to match the might of any of the Three Fundamental realms. The Celestials led the Heavenly Realm, The Immortals led the Earthen Realm and Demons led the Infernal Realm while the Rulers controlled all the minor realms. Together, they formed The Myriad Unity and allowed peace to reign supreme. The mortals were allowed to cultivate and reach for the Heavens as a balance was installed between the Heaven and Earth, all according to the Heaven’s Will. And yet, among the billions of trillions of living beings within the Myriad Unity, one seemed unsatisfied. “They are lying to us.” This man went against all known truths and contradicted the very gods. “We are in a false world! Mere pawns used to study an outcome!” And so in search of freedom and truth, this man committed the ultimate taboo. He rebelled.

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.

“Wang Cheng, we need to practice more!”

“No, I want to guarantee eight hours of sleep every day.”

…

“Wang Cheng, it’s almost nine o’clock, and you’re late.”

“Didn’t you go to work at nine o’clock? It’s still a minute away. Where’s the punch card machine?”

…

“Wang Cheng, what variety show do you want to be on?”

“Is there a fishing variety show?”

- Description from novelbuddy

America, 1980. No sooner had Xu Yi transmigrated than he was put on the dissection table; then he gradually came to understand the true nature of this world. “Studying medicine can’t exorcise undead demons; I must become an exorcist!” he resolved silently to himself. On a misty, rain-soaked night. “Miss Evil Spirit over there, the night is cold and damp; be careful not to catch a chill! Come over here and warm yourself by the fire!” Xu Yi said, holding a lighter, as the pale gold flame slowly approached the other. The Evil Spirit shrank back, looking at Xu Yi with fear. “Don’t be afraid, I just want to warm you up...” Xu Yi’s face broke into a warm smile, “by setting you on fire!” Ding dong! Ding dong! “Sign-in at the Land of Fear successful, Resurrection Coin awarded!” “Synthesis pathway requirements met, do you wish to combine the following entries?” Psychic + Scholar + Painter = Psychic Painter! Saintly Offspring + Gunfight Technique + Revolver Mastery = Holy Gunslinger! Undead + Revelation + Holy Nation = God!