Henkyou no Kusushi, Miyako de S Rank Boukensha to Naru: Eiyuu-mura no Shounen ga Cheat Yaku de Mujikaku Musou

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! "

(Source: K MANGA)