蔡京
Viewing the case as a grave matter, Cai Jiu writes a letter to his father, the Grand Tutor Cai Jing, in the imperial capital Dongjing (東京; present-day Kaifeng, Henan), to seek advice. Dai Zong is assigned to deliver the letter. When resting at an inn of Liangshan run by Zhu Gui, Dai is drugged. Luckily the letter on him reveals his identity. He is brought to Chao Gai, the chief of Liangshan, and Wu Yong. Wu suggests faking a letter by Cai Jing to order Cai Jiu to send Song Jiang to Dongjing for punishment. The plan is to rescue Song midway. But he needs the help of the scholar Xiao Rang, who could imitate Cai Jing‘s distinctive and universally recognised handwriting, and the engraver Jin Dajian, who could fabricate Cai‘s personal seal. Dai Zong hurries to call on the two men and lies to them that their skills are needed in the renovation of a temple. Xiao and Jin are brought near to Liangshan, where they are kidnapped. The two have no choice but to join the stronghold and participate in Wu Yong's plan.