Leo Su, a modern chef, travels to the Tang Dynasty's Zhenguan era. He feeds Princess Jinyang (Cece). With culinary skills, he captures Princess Cece's heart with delicacies, gaining the trust of Li Chengqian, Empress Zhangsun, and Taizong Li Shimin. He nurses Princess Cece, rewriting her fate. He introduces technologies (salt purification, potato cultivation, glassmaking), altering the Tang's destiny. He becomes a legendary figure, influencing Zhenguan.