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!

Yona and friends embark on a dangerous mission to get Meinyan back--by sneaking into an enemy camp where the Dromos assassins await! Val must battle his former South Kai comrade General Hittan for Meinyan's sake, but the rescue effort backfires once the cruel Emperor Chagol draws near!