The heroine pretends to be stupid. In the ancient setting, the heroine is a silly concubine who looks confused but is actually smart at heart. She recruits her son-in-law, Prince Can, and the two support each other in getting along. The heroine avoids many overt and secret fights in the palace by pretending to be stupid. At the same time, she also uses her wisdom to help Prince Can achieve a career. The relationship between the two gradually warms up in the process.