Lan Yue, the legitimate daughter of the Lan family in the south of the Yangtze River, and Mu Lin, the son of the Mu family in the capital, have been engaged since childhood. The Mu family planned to break off the engagement in order to cling to the powerful and spread rumors to destroy her reputation. The head of the Lan family was forced to expel her from the house and only allowed her to take her with her. An old wooden box left by her deceased mother; Lan Yue decided to go to the Western Regions to make a living. On the way, she encountered a robbed silk caravan. She exchanged an east pearl in the wooden box for a broken purple silk, and unexpectedly found it in Kabul. She sold the goods at a hundred times the price at the Shigar market, and discovered that the people of the Western Regions were hungry for rare dyes from the Central Plains. Based on this, she bartered, bought low and sold high, and raised the principal to fifty gold in three days. However, she was targeted by Ma Chenghu, the president of the local chamber of commerce, who set up a trap to defraud her of all the goods with a fake deed. Lan Yue was penniless, but met Su Zhe, a down-and-out Han strategist who called himself "Shahu" at the inn. The two exchanged information for a meal, and the two formed a temporary partner; Su Zhe found out Ma Chenghu's smuggling route, and Lan Yue took advantage of his greed to lure Ma Chenghu into buying a batch of high-quality spices at a high price. Businessmen from many countries build trust; she secretly investigates the truth behind the breakup of the engagement, and discovers that behind the Mu family is a wealthy family from Beijing that covets the trade route to the Western Regions, and her mother's wooden box contains a map of a secret road leading to the Great Yuezhi; on the emotional line, Su Zhe's true identity is the son of a fugitive criminal.
