click to show/hide spoilersAfter the prince kicks out his step brother and claims throne, he is put through a conflict between his court nobles and Hong Guil Dong's army of bandits. The king decides to eliminate Hong Guil Dong and his bandits to protect his throne after an arguement with Hong and wages a siege againt Hong's mountain fort. Hu Inok abandons king to defects to Hong Guil Dong and marry him at the fort, just before the final battle and everyone(yes everyone) dies in the final showdown. However, the legend of Hong Guil Dong lives on among common forks.
This ending is very different from the classical novel on which this series is based on. In the classical novel, Hong Guil Dong leads his followers and found The Kingdom of Okinawa. Hong sisters obviously wanted to have the most dramatic ending possible, and decided to kill off everyone in a tear jerker.