Henkyou no Yakushi, Miyako de S Rank Boukensha to naru is a Manga/Manhwa/Manhua in english language, Drama series, english chapters have been translated and you can read them here. You are reading chapters on kissmanga.in fastest updating comic site. The Summary is
Leaf has been enjoying a peaceful life in his village at the farthest end of the country, but everything gets turned upside down when his fiancée betrays him, robbing him of his home, work, and everything he cherishes.
Wandering around, lost on what to do next, he encounters a distinguished lady in peril who will change his life forever! Using the cheat-like power of medicine and drugs the world scoffs at, Leaf now begins his journey to become the almighty healer!
It’s one of those mc grownup at op village doesn’t know he’s op
Pass
It’s basically about an OP MC living in a village without knowing he’s OP.
I thought I’d give it a try, but then the MC spared a demon out of all things. So yeah, that’s a bit too naive even for me.