Mu Chun

The younger brother of Mu Hong the "Unrestrained", Mu Chun gets his surname "Little Unrestrained" as a spill-over from his brother's. From a wealthy family with great influence in Jieyang Town (揭陽鎮; believed to be in present-day Jiujiang, Jiangxi) near the Xunyang River. Mu Chun fights well with a sabre.

When Song Jiang is in exile to Jiangzhou (江州; present-day Jiujiang, Jiangxi) as a mitigated sentence for killing his mistress, he passes by Jieyang Town with his two escorts. There he runs into Xue Yong, who is performing martial stunts on roadside to entertain pedestrains, who might tip him or buy his medicine. When Xue first came to Jieyang, he did not go to pay respect to the Mu brothers, who are feared by the local people. To punish him for the snub, the brothers have ordered the townspeople not to patronise Xue. Not knowing that, Song Jiang generously tips him impressed by his performance and in sympathy that he makes no money. Angry that Song made his family lose face, Mu Chun, who is among the onlookers, rushes forth wanting to beat him up. However, he is floored by Xue Yong.

Humiliated, Mu Chun orders every inn and house in the town not to offer Song Jiang accommodation for the night. The one person who offers him lodgings turns out to be the Mus' father, who is kindly and unaware of the goings-on. While at the Mus' manor, Song Jiang overhears Mu Chun looking for his brother Mu Hong to help track him down. He also learns that Xue Yong is captured and being beaten up.

Song Jiang and the two constables sneak away under the cover of night from the manor. But the brothers have learnt about their staying at their house and come after them. In desperation the three board the boat of the pirate Zhang Heng. Midway across the Xunyang River, Zhang wants to kills them. Fortunately, Li Jun, whom Song Jiang has recently befriended at Jieyang Ridge, passes by and the killing is averted. Zhang is shocked to learn that the exile is Song Jiang, who is famous as a chivalrous hero. So are the Mu brothers, who have been waiting at the bank. All of them apologise to Song and treat him as an honoured guest before seeing him off to Jiangzhou.

Song Jiang is found to be the author of a seditious poem written on a wall in a restaurant in Jiangzhou and sentenced to death. The chieftains of Liangshan Marsh rush to Jiangzhou and rescue him at the execution ground. After fleeing Jiangzhou, the group is stranded at a riverbank. Just then Li Jun, the Mu brothers and other friends Song Jiang made recently in the Jieyang region arrive in their boats on their way to save Song Jiang. They ferry the outlaws to the Mus' manor. The whole group later proceed to Liangshan, where the Mu brothers join the band.

Mu Chun is appointed as one of the leaders of the Liangshan infantry after the 108 Stars of Destiny came together in what is called the Grand Assembly, . He participates in the campaigns against the Liao invaders and rebel forces in Song territory following amnesty from Emperor Huizong for Liangshan.

Midway in the campaign against Fang La, Mu Chun stays behind in Hangzhou to look after six Liangshan heroes who have fallen sick. The campaign ends in victory for Liangshan, but that does not cheer Mu Chun as his brother Mu Hong has died from illness in Runzhou (潤州; present-day Runzhou District, Zhenjiang, Jiangsu).

When the survivors of Liangshan return to the imperial capital Dongjing, Mu Chun is conferred the title "Martial Gentleman of Grace" (武奕郎). Mu Chun, however, declines it and chooses to return home to lead the life of a commoner.

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