Nangong Li, the legitimate daughter of the Nangong family, appears to be a weak lady, but in fact she is the young master of the mysterious organization "Tianji Pavilion" in the world. She is proficient in medical, poison and mechanism skills. Because her family was framed by the Beiming family and everyone was executed, she escaped by chance and kept her name anonymous, vowing to take revenge. Bei Minghan, the legitimate son of the Beiming family, a cold-faced general with great military exploits, was known as the "Great Yan War God". He appears to be cold and ruthless, but in reality he has the world at his heart and is secretly investigating the conspiracy of his father, the head of the Beiming clan, to collude with the enemy. Nangong Li sneaked into Beiming Mansion for revenge and became Bei Minghan's personal maid. The two grew from mutual suspicion to trust, and finally joined forces to expose the conspiracy of Beiming's family master, quell civil strife, resist foreign enemies, and jointly protect Dayan.
