Su Yu, a standard post-90s generation, psychiatrist, 25 years old. Because he did not agree to break up, he was killed by his girlfriend with a knife, so he traveled back to the Beiming Dynasty and the ninth prince Bei Mingyu. Bei Mingyu had been taught by Die Ao, a medicine man, since he was a child, and he had excellent medical skills. After Su Yu traveled through time, he found that the Beiming Palace was full of dangers. He had to pretend to be poisoned and visited famous doctors in various countries. During this period, he met Dongyun Yu, the princess of Dongyun Kingdom, and Xilieqin, the fifth prince of Xilie Kingdom. Bei Mingyu was engaged to Nan Siliang, the young princess of Nansi Kingdom. One of them was unwilling to marry (Su Yu was unwilling to marry after time travel, but the real Bei Mingyu had a crush on Nan Siliang) and the other was unwilling to marry, and a series of stories happened.
