After transmigrating into the book Water Margin, he matches the 108 heroes with spouses, saving Liangshan by taking an indirect route.
After his fiancée made a joke, Wang Jin transmigrated into Water Margin. Unless he got all 108 heroes married and started families, he would be trapped there forever.
From then on, Wang Jin became a matchmaker in Water Margin.
He matched the spineless Lin Chong with a mature, assertive woman. From then on, Lin Chong became decisive and ready to fight anyone who crossed him.
He matched the hypocritical Song Jiang with a fierce wife. From then on, Song Jiang became henpecked.
He matched the scheming Wu Yong with a manipulative flirt. From then on, Wu Yong became a lovesick fool.
As the number of matches grew, Wang Jin unwittingly discovered that all of Liangshan took orders from him alone. He had become the leader of Liangshan.
So Wang Jin swept his arm and ordered the whole army to march. He, Wang Jin, would overthrow the emperor and take his place.
