Shen Shutong, the daughter of the Grand Secretary, marries Pei Zhiyuan, the General Who Guards the Far Reaches. However, her husband repeatedly favors his confidante, Xie Jinluan, even allowing her to trample on a precious letter of introduction to a renowned divine physician. Her heart turns cold, and she resolves to leave him. During the royal military tournament, she demonstrates the martial arts she has painstakingly mastered and obtains an imperial decree granting their divorce, reclaiming her entire dowry. Later, the truth behind an old case on the northern frontier comes to light: Xie Jinluan once put her own survival above the nation's interests, while Pei Zhiyuan's indulgence of his favorite concubine leads to disaster. Both meet tragic ends. Shen Shutong finally escapes her unhappy marriage and develops mutual feelings with Prince Jing, Xiao Jingce, whom she once helped. Through tests of trust and time spent together, they untangle their complicated feelings and heal their emotional wounds. With ten miles of red silk celebrating their wedding, they leave the past behind and embark on a beautiful future together.