The Downhill Medical Saint

The Medicine King Valley was wiped out, and Jiang Ye was the only survivor. Carrying half a medical classic, he opened a small clinic in the south of the city. Patients given a death sentence by major hospitals, he saves with three needles; strange diseases with no identifiable cause, he sees through at a glance. Jiang Ye has three rules: one, queue up; two, treat first, collect payment later; three, do not treat the wicked. But some people refuse to believe it and insist on testing whether his needles truly obey. — Description from novelcodex.org