Dai Zong
When Song Jiang is in Jiangzhou (江州; present-day Jiujiang, Jiangxi), where he is exiled for killing his mistress Yan Poxi, he could move in and out of prison freely with permission of the chief warden Dai Zong, a friend of Wu Yong. One day he gets drunk in a restaurant alone. Lamenting his misfortunes, he writes a seditious poem on a wall in the restaurant, which he forgets the next day. Huang Wenbing, a petty official, discovers the poem and reports it to Cai Jiu, the governor of Jiangzhou, leading to Song being locked up and flogged. Cai Jiu orders Dai Zong to take a letter to his father Grand Tutor Cai Jing in the imperial capital Dongjing (東京; present-day Kaifeng, Henan), from whom he seeks advice on the matter.