On the 19th day of the twelfth lunar month, it was the 60th birthday of Old Master Yu from Yujiazhuang, who was known as the "Medicine Immortal" in the capital city of Da'an. By the 18th day of the twelfth lunar month, guests who had come to congratulate Old Master Yu had started to arrive one after another, making the entire Yujiazhuang bustling with activity...