Li Mengmeng was regarded as an idiot since she was a child, and she was engaged to her childhood sweetheart, the prince of the Hou family. The prince looked gentle on the surface, but in fact he thought she was stupid and embarrassing. He teamed up with the bully princess who was bent on clinging to power, and tore up the marriage contract in public at the Hundred Flowers Banquet, which was extremely humiliating. When her heart was broken, Li Mengmeng's sleeping Xingyue bloodline unexpectedly awakened, and she gained the ability to listen to the heart sounds of all things and faintly predict good or bad luck. In order to find out the truth about her parents' death and regain everything, she decided to stop pretending. Along the way, her ignorant but accurate "prophecies" and her kind and pure nature attracted the attention and protection of the reclusive national master, the bohemian young master of the southern border, the commander of the loyal dog guard and even the enemy's proton. From initial pity to sincere doting, everyone joined forces to tear down the villain's hypocritical mask and help her uncover the mystery of her life step by step. In the end, her bloodline was fully awakened, and she became the unique "divine saint" of the Chen Dynasty, allowing all those who had despised her to look up to her.