The time traveler Xu Xian, as the idle brother-in-law of Prince Su Yu, sees that the East Palace is weak and the treasury is empty, so he no longer lives in confusion. After being framed and involved in the Jiaofangsi murder case, he cleverly proved himself and showed his resourcefulness. By chance, he met Su Yunzhang, the incognito Emperor of Chu, and reached a cooperation under the pseudonym Zhao Guang. He teamed up with Tang Xiao to open the Yongxing Escort Bureau, relying on the post station to run the letter business and accumulate huge sums of money for the royal family. King Jing coveted the property and instigated Meng Yu to provoke and frame the prince. Xu Xian followed the trend, exposed Meng's evil deeds of abducting and selling women, overthrew Liu Guogong, and won over the forces of Lu Guogong to consolidate the alliance. He also proposed a plan to divide the Liangzhou vassal king, and also set up a sugar shop to fill the private treasury of the East Palace. He transformed from a playboy to a confidant of the prince.
