Emergency physician Lu Yuan has traveled back in time to the Ming Dynasty for ten years. All he wants is to descend the mountain and live comfortably as a wealthy man, eating his fill and doing nothing. But the noblewoman he casually saves at a roadside tea stall turns out to be Empress Ma, while the hot-tempered burly man is none other than Zhu Yuanzhang. An ancestral jade pendant makes him the emperor's brother-in-law. The emperor forces him to attend court, but all he wants is to sleep. The entire imperial court waits for him to make a move, but all he wants is a bite of salt without an earthy taste. From turning poisonous salt into refined snow-white salt and saving Chang Yuchun's life to driving the Left Chancellor mad, this brother-in-law who only wants to take it easy becomes someone the entire Ming Dynasty cannot do without.