Dragon City's Lost Battle(척살자객)

Neungan-guk's best assassin dog is on a mission to Bukki-guk to avenge his brothers who died unfairly in the past. Dog joins Ga and Young in Bukkiguk and finds out that this mission is a conspiracy over the recipe for the Jangsaengdan medicine in the process of finding a secret document belonging to the general of Bukkiguk...