When Song Jiang is attacking Daming Prefecture with a military force to rescue Lu Junyi and Shi Xiu, he suddenly falls very ill with a tumour on his back. A fever comes on and never subsides, causing him to finally fall into delirium. Back in Liangshan with his troops, Song continues to be bedridden, with his condition deteriorating and all medicines to no avail. Zhang Shun, who grew up in the Yangtze region, remembers that once his mother suffered from a similar illness and was healed by An Daoquan. He volunteers to find An in Jiankang and bring him to Liangshan. Zhang Shun finds An Daoquan, who agrees to go to Liangshan only after his persistent plea. That night An takes Zhang along when he visits a prostitute called Li Qiaonu whom he is besotted with. Zhang is worried that An is not willing to part from Li, who keeps plying the physician with drinks that he is finally drunk as a fiddler. Then he discovers that Zhang Wang, apparently only a frequent patron of Li, also calls on the woman. After the two disappeared into a room, Zhang Shun kills the mamasan and two servants of the brothel. Then he knocks on the door of Li's room and hacks her to death when she opens it. Zhang Wang, hearing the cry, gets away. Remembering what Wu Song did in Mengzhou, Zhang Shun writes with the blood of Li on the wall a supposed confession by An himself that he is the killer. When An wakes up, he has no choice but to go with Zhang Shun to Liangshan. At Wang Dingliu's inn, Zhang Shun relates what has happened. Wang notices Zhang Wang is at the bank and asks him to ferry his two "relatives". When the boat is midstream, Zhang Shun, who has exchanged clothes with An Daoquan to deceive Zhang Wang, overcomes the boatman with the help of Wang. They tie him up and dump him into the river. Zhang Shun asks Wang to join Liangshan and the young man gladly agrees. At Liangshan, An cures Song Jiang of his life-threatening illness.
Campaigns
An Daoquan is appointed as Liangshan's physician 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. Just before the battle of Hangzhou in the campaign against Fang La, Emperor Huizong summons An Daoquan to the imperial capital Dongjing because he is down with a minor illness. After healing the emperor, An is retained in the palace where he serves as an imperial physician.
