Luan Tingyu
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Luan Tingyu (栾廷玉) is a character in the epic Chinese novel, the Water Margin.
Luan was the chief military instructor of the Zhu Family village - who was trying to capture Chao Gai and his Liangshan bandits for the government bounty - and was nicknamed 'The Invincible'. Luan was once fellow students with Sun Li, so Sun Li had no problem entering the Zhu Family Village to act as a spy for the Liangshan heroes. The Zhu Family village was eventually defeated by the Liangshan heroes, who co-ordinated well from inside(led by Sun Li) and outside(led by Song Jiang).