Although Song Jiang himself did not have much ability, in "Water Margin" he also accepted two apprentices, namely the eldest son and the second son of Kongjiazhuang. These two men themselves did not have much ability. The most outstanding moment in their lives was when they took advantage of Wu Song's drunkenness and led dozens of people to capture Wu Song alive. After the two went to Liangshan, due to Song Jiang's relationship, they were placed in the army and entrusted with important tasks. Song Jiang did this mainly because he wanted to protect the two of them through the army.

Kong Ming and Kong Liang are characters created by the author of "Water Margin". They have low abilities, but not long after they appear on the stage, they frustrate Wu Song, who is highly capable. On the way to Erlong Mountain, Wu Song passed by Kongjiazhuang. Here he wanted to find a small shop to take a break and fill his stomach, but the meat in the small shop was all sold out, and only white wine was left. Therefore, Wu Song could only drink liquor on an empty stomach. When Wu Song was worrying about food, he happened to meet Kong Liang who brought his own delicious food, so Wu Song took advantage of the drunkenness to beat Kong Liang up and snatched all his food.

After drinking and eating, Wu Song accidentally fell into the river due to drunkenness. He happened to run into Kong Ming who came to avenge Kong Liang, so Wu Song was captured back to Kongjiazhuang. Wu Song was detained for half a year after being escorted back to Kongjiazhuang. Later, because of Song Jiang's relationship, Wu Song and the two Kong brothers reached a reconciliation. After staying in Kongjiazhuang for a few more days, they went their separate ways. Later, because the two brothers of the Kong family failed to attack Qingzhou, they asked Song Jiang for help. In the end, Qingzhou was attacked, and these two brothers became Song Jiang's apprentices.

After going to Liangshan, Kong Ming and Kong Liang did not make many achievements, but they relied on their relationship as Song Jiang's confidants to rank 62nd and 63rd in the rankings. position and held important positions in the military. The first task of the two of them was to protect Song Jiang's safety, but Song Jiang knew that the two of them did not have much ability. The reason why they were placed in the army and entrusted with important tasks was mainly to protect them through the army.