At the time of Qin Xiaogong's political reform, the young Lu Xing fought a bloody battle in Hexi and was promoted to the title of Zuogeng due to his military merits, but he retired due to serious injuries. Witnessing the shortage of grain and salt in Qin and the difficulties in water transportation, he took the risk to form an alliance with Zheng Zhiwei, a wealthy businessman in Qi: he exchanged silk from Guanzhong for salt and grain, and secretly raised funds for shipbuilding. Caught between Shang Yang's iron laws and imperial ambitions, Lu Xing used business methods to forge a secret line to save the country. Later, he single-handedly fought against the commercial war of the six countries, which greatly improved the strength of Qin during the Warring States period, but he also suffered from the changes in the current situation.
