On the Double Ninth Festival wedding, An Tang discovers that the groom turns out to be his swapped twin elder brother Pei Mubai—her fiancé Pei Shaoqing, in order to marry her elder sister An Lan, colluded with the whole family to send her away. She calmly complies with everyone's wishes, accompanying Pei Mubai far away to the Western Frontier. The Western Frontier has no cold glances or harsh reprimands, only a courtyard full of civet cats and a line saying it does not matter even if you make a mistake. Pei Mubai prepares teachers and advisors for her, helping her grow from a young miss who does not understand business into an independent imperial merchant, successfully negotiating the Western Frontier salt and iron trade route. Pei Shaoqing repents and confesses, but she says it is no longer possible. A year later, the new trade route is completed, with a silver hairpin by the sea as a pledge, and the two make up for their wedding.