The chivalrous hero Ling Potian and his food-loving brother Shi Gandang join forces in the Verdant Bamboo Grove. When they settle at the Drunken Immortal Tavern, they encounter Liu Ruyan and Yun Ruoshi, who carries the Hundred Herbs Poison Manual. Yun Ruoshi is being hunted by Tie Zheng, the chief of Black Dragon Stronghold, who intends to use the manual to concoct evil medicines. The four decide to join forces and infiltrate Black Dragon Stronghold to retrieve the book. Along the way, they cleverly use a muscle-weakening powder to subdue the stronghold's patrolling guards. With her exceptional disguise skills, Yun Ruoshi infiltrates the stronghold and discovers the secret chamber where the manual is kept. At midnight, the group splits up and climbs over the walls, successfully finding the Hundred Herbs Poison Manual. Thus concludes their adventure to outwit the villains and recover the forbidden book.