Princess Yona lives an ideal life as the only princess of her kingdom. Doted on by her father, the king, and protected by her faithful guard Hak, she cherishes the time spent with the man she loves, Su-won. But everything changes on her 16th birthday when tragedy strikes her family!

Things look dire for Kohka as South Kai's elite assassins, the Dromos, infiltrate Hiryuu Palace! South Kai's General Val gets a taste of the old days as he fights alongside former General Meinyan, but the biggest surprise is who appears before them in the midst of battle!