The 4th book by Wind Through the Forest

Fifty-two-year-old Zhao Dazhu had been a bachelor his whole life, left destitute and ridiculed by the villagers, and repeatedly bullied by the village bully.
He thought his life would end like this, but he unexpectedly received a mysterious inheritance and learned unparalleled medical skills, thus embarking on an extraordinary life!
Those who took from him must return double the amount; those who bullied him must kneel before him and beg for mercy!