On the wedding day of grassland girl Zhuoma, her fiancé Luosang favors Central Plains female historian Lin Qingyan everywhere, and even gifts the couple's token, the Gau box, to the other party. Zhuoma shoots the agreed red whistling arrow, and Jiang Cuo, who has waited eight years, gallops over to snatch the bride. It turns out Lin Qingyan is a Shourong spy, using map-drawing to spy on border defenses and repeatedly harming Zhuoma and Jiang Cuo. After going through dangerous situations, all the criminals are brought to justice, and Luosang also receives penal servitude for the mistakes committed by his foolishness. Zhuoma lets go of the past, circumambulates the prayer flags with Jiang Cuo who has waited for her for eight years, and harvests a fulfilling love.