Su Wanying, on the surface, is the daughter of a criminal minister who is no one in the capital. She lives under someone else's roof and makes a living by selling paintings. His true identity is that he is the only descendant of "Xuanjing", the highest commander of the former "Xuanjing Division". The "Xuanjing Division" used to be a secret agency that monitored officials and protected the imperial power. Later, it was framed and executed. She escaped by chance and stayed dormant for many years, just for revenge. The male protagonist, Lu Jinyan, was the heir apparent to Prince Ning of the court, and was known as the "most powerful official in the capital." He was in charge of the defense of the capital, and he was deeply scheming and ruthless in his actions. While assisting the prince, he secretly communicated with the ambitious King of Qi, walking on the edge of power, with the goal of stirring up trouble and avenging his mother and concubine.
A "Murder Case in the Master's Secret Room" entangled the fate of the two people. In order to track down clues, Su Wanying got involved in the whirlpool as a painter. She worked step by step, using the secret techniques and intelligence network left behind by the "Xuanjing Division" to constantly "fall off the horse" and cover up perfectly. Lu Jinyan regarded her as an interesting chess piece, but through trials and confrontations, he was gradually attracted by her tenacity and wisdom...
