Li Jun is a man eight chi tall, with thick eyebrows, large eyes, a reddish face, wire-like whiskers and a loud booming voice. He is not only well versed in martial arts, but is also a powerful swimmer capable of performing many feats in the water. He is thus nicknamed "River Dragon". Li Jun is one of the leaders of the Liangshan navy. After the campaign against the rebel leader Fang La, Li Jun with his friends sail to the Siam (Thailand), where Li Jun becomes the king while his companions become his subjects.