Siheyuan: the Factory Doctor Returns for Revenge

[Siheyuan + Revenge + Decisive Killing] A factory doctor named Chen Yu came to No. 95 Nanluogu Lane. He has excellent medical skills and a kind heart. He treats any sick family for free. Neighbors say that Dr. Chen is the reincarnation of Bodhisattva. Only Chen Yu himself knew that every "medicine" he prescribed was a chronic poison. Twenty years ago, these people drank up his grandfather's blood. Twenty years later, he wants these people to pay for their debt with blood!