Guo Sheng hears about
Lü Fang being an outstanding user of
ji and wants to find out who is more worthy of the weapon. He travels to Mount Duiying () or Mount Mirror Image, which consists of two hills facing one another, one of which is occupied by Lü and his bandit gang. Guo settles on the other hill with his own men and challenges Lü to a one-on-one duel on horseback. As neither could win, the engagement goes on and off for days.
Song Jiang,
Hua Rong and other outlaws of Mount Qingfeng pass by Mount Duiying as they travel to join
Liangshan Marsh after causing mayhem at
Qingzhou including routing a government army. They come upon the duel between Guo Sheng and Lü Fang. It happens that the tassels of the two
ji get tangled together. The two fighters struggle but could not free their weapons. Seeing that, Hua Rong fires an arrow that hits the tangled point and separates the weapons. Everyone present cheers. Guo and Lü stops their fight and comes to greet Hua and his group. Upon learning that the group is going to Liangshan, both wanted in and are accepted. == Campaigns and death ==