Luan Yanyu of posthumous title in Liangshanbo.

Luan, a teacher in Zhujiazhuang, is a character in the classical novels Water Margin, Water Margin and Dangkou Biography, and is called an iron bar. He is the elder brother of the sick Wei Chi Sun Li. He has high martial arts skills and dares to be improper. Ceng Fei killed Ou Peng with a hammer, and captured Qin Ming and Deng Fei alive with a trip rope and a grappling hook. When Zhujiazhuang was attacked by Liangshan, he died in the disorderly army.

Luan yuting "This man has the courage to do anything wrong" is so impressive that it seems that he should play a leading role like Shi Wengong in Zengtou City. But in the whole "Strike Three", there is only one positive description of his hand. At that time, Zhu Long was the enemy of Qin Ming. However, Luan Yuting hit Ou Peng with a hammer and pretended to fail. He captured Qin Ming and Deng Fei alive with a trip rope and a grappling hook, and performed well. But even so, we don't know why he is called "iron bar". The novel only says that he "got on the horse with a hammer and will come out after being shot", so it seems more appropriate to call him "teacher hammer". Luan Yuting's whereabouts are a muddled account. In the last battle, the sick Wei Chi Sun Li and others pretended to be loyalists and attacked Zhujiazhuang from the inside. When the leaders made contributions, Song Jiang sighed, "It's a pity to kill that hero Luan Yu Ting." Surprisingly, the deaths of Zhu's three heroes are clearly written, but the novel doesn't explain who Luan fought with and was killed by. Looking back on the pre-war situation, it is also very strange that Song Si Road attacked, namely East Three, West China Rong Three and South Three, without mentioning North Road. Stranger still, Luan Yuting said, "I led a team out of the back door and killed this team that was due west and north." Zhu Hu also claimed to kill people in the southwest. If there are Liangshan soldiers in the northwest and southwest, there will be more than four roads. Northwest, southwest, maybe due north, due south. Jin Shengtan concluded that Luan died in the North Road, and said that the reason why he didn't specify who was the leader of Liangshan in the north was because Luan was a hero, and the author "hated not to kill him" and didn't want to write his name.