The Brilliant Healer's New Life in the Shadows Isshun de Chiryou Shiteita no ni Yakutatazu to Tsuihou Sareta Tensai Chiyushi, Yami Healer Toshite Tanoshiku Ikiru English Subbed

Banished as “useless,” Zenos, a self-taught healer from the slums, turns despair into defiance and opens a secret clinic in the city’s shadows. With unlicensed, unmatched magic, he cures, comforts, and rights wrongs, quietly becoming a legend. But as his power grows, even the royal palace takes notice. Can he buck the odds and heal a world that cast him aside?

(Source: Crunchyroll)