Modern physician Shen Zhiwei enters another world in soul overnight, marrying into a household in another's stead. At that time Pei Jin was still in the military and had not yet been enfeoffed as a general; their first encounter led him to misunderstand her deep intentions. Shen Zhiwei remained neither servile nor overbearing, resolving wave after wave of crises with her exquisite medical skills, aiding neighboring villagers, and opening a clinic to relieve the impoverished. Supporting one another all the way, Pei Jin performed meritorious service on the battlefield and became a general, while she won respect with a benevolent heart, together guarding the rivers and mountains of the nation.