In the flourishing Tang dynasty, Ye Yuan’an was the daughter of a high official in Luoyang. She was very warm-hearted, and in a murder case of a courtesan, she knew the brave head constable Zhao Lanzhi. The two cracked the case together and became good friends. Yuan’an saved Mu Le in the market, a man with mysterious identity who lost his memory, and he became a servant in her household, yet he gradually fell in love with Yuan’an. But what is Mu Le’s true identity?