Overview

Sol-i and Song-i head toward Hanyang (Seoul) carrying the blueprints for a cannon invented by their father. Along the way, they run into bandits and fall into danger, until Baek Du-geon appears, defeats the bandits, and rescues them. Upon arriving in Hanyang, Sol-i and Song-i hand the cannon and blueprints over to Vice Minister Hong, while Baek Du-geon and the Three Bug Musketeers become constables, causing a huge commotion. However, Vice Minister Hong—now in possession of the blueprints—conspires with the Police Chief to sell them off to a Japanese spy (Miyamoto). As Baek Du-geon and the Three Bug Musketeers set out to stop them, a massive, bloody battle erupts against the Japanese spy and his ninjas.