Nangong Li, the legitimate daughter of the Nangong clan, appears to be a delicate young lady, but is in fact the young mistress of Tianji Pavilion, a mysterious organization in the martial world. She is skilled in medicine, poisons, and mechanisms. When the Beiming clan frames her family and has them all executed, she narrowly escapes, assumes a new identity, and vows revenge. Beiming Han, the legitimate son of the Beiming clan, is a cold-faced general with a string of military victories, hailed as the Great Yan God of War. He seems cold and heartless, but cares deeply for the realm and secretly investigates a conspiracy involving his father, the Beiming clan patriarch, and an enemy nation. Nangong Li infiltrates the Beiming residence to take revenge and becomes Beiming Han's personal maid. From mutual suspicion, they gradually grow to trust each other. In the end, they join forces to expose the patriarch's conspiracy, quell the rebellion, repel foreign enemies, and protect the Great Yan realm together.
