Capital ruffian Li Xiyao drunkenly mistakenly rescued Prince Danyang's heir Lu Yunchuan, who was suffering from a severe poison, and casually left behind three copper coins as a 'hardship fee', causing a string of comical misunderstandings. The heir searched the city for her, but she fled all the way to a bandit den and sneaked into a military camp. Disguised as a man, the bickering couple bantered and crossed moves, going from competing with each other to secretly developing feelings. When the border was in emergency, she cleverly set up mechanisms to smartly defeat the enemy troops; when the dust settled, he handed over military power and proposed with three letters and six etiquettes to welcome her across the threshold, achieving a destined marriage filled with laughter and romance.