A childhood-sweetheart romance where two people fall in love after marrying and head toward each other in turn. The hero, Li Yuheng, is the legitimate son of the late empress and the crown prince-to-be. He seems cold and merciless, acting decisively and ruthlessly without hesitation, and keeping everyone at arm’s length. She is the only one for whom he repeatedly makes exceptions. The heroine, Princess Yong’an Zhao Yue, lost both her parents when she was young. Since they gave their lives for their country on the frontier battlefield, the emperor entrusted her to Consort Yun in the palace, where she was raised with the privileges of a princess. He also decreed that she would become the crown princess. As she grew up, her beauty became ever more breathtaking, earning her the title of the capital’s most beautiful woman. She has enjoyed years of luxury and comfort, and Consort Yun has loved her like her own daughter, letting her experience a mother’s love. But Zhao Yue is not happy, because all this was bought with her parents’ lives, and she is destined to spend her life trapped in the palace, with no freedom ever again. Later, she meets the second male lead, and being with him makes her feel free to be herself, no longer constrained by the palace rules. Gradually, she mistakes that feeling for love. Since she is already promised in marriage, she dares not cross the line and can only keep her feelings hidden... After marrying the hero, the two treat each other with respect, like guests. She does not understand what it means to love someone, while the second female lead repeatedly schemes against her. The hero silently protects her and gives everything for her, never saying a word, quietly doing everything for her. Eventually, she sees clearly how she feels: “She had fallen in love with him long ago.” After weathering all kinds of hardships, the two find their happy ending together, and they even have an adorable daughter.