晁蓋
Wu Yong first appears in the book when he watches Lei Heng, a chief constable of Yuncheng, fight the vagabond Liu Tang from his village school. Liu has come from afar to ask Chao Gai, the headman of Dongxi Village, to partner him to hijack valuables in transportation to the Grand Tutor Cai Jing in the imperial capital Dongjing. But he was tied up by Lei's patrol group while sleeping drunk in a temple because he looked suspicious. Chao Gai tricked Lei to release Liu when the group came to take a rest at his manor. But Liu is embittered and caught up with Lei to demand the money that Chao has given him as compensation for causing him much trouble. Wu Yong, who is a friend of Chao, steps forth to intervene when he senses Lei is about to lose. Chao comes to the scene and puts an end to the fray.