Watch on SFlix. Liu Wan Su, a famous doctor in Hejian, was ordered to treat the princess of the Kingdom of Jin, but was involved in a court conspiracy and was forced to die. Liu Wan Su, who was on the run, saved tens of thousands of people during the great plague, and left a good story of "one needle cures two lives", but he also exposed his whereabouts, which attracted the assassins of the Kingdom of Jin to kill him.