Su Jin, the deputy director of the modern emergency department, accidentally traveled to the "Daliang" of the fictional dynasty and saved the subordinates of Xiao Yu, the king of Zhenbei, with his superb medical skills. Forced to be involved in court disputes, she resolved crisis after crisis with kindness and benevolence, but was repeatedly put in danger due to the conflict between modern ideas and ancient etiquette. When the plague raged, powerful officials framed her, and war broke out, she and Xiao Yu joined hands to fight against the dark forces, using medical skills and wisdom to rewrite the fate of the dynasty. In this legend that spans time and space, two lonely hearts gradually get closer and jointly create a new chapter in medical reform.