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!

After Yona and her friends save the Fire Tribe from an invasion by the Kai Empire, word of their prowess spreads amongst those with deep faith in the Crimson Dragon King. Yona and the gang take cover at Saika Palace, but what trouble awaits when Su-won's advisor Keishuk shows up to guard the Fire Tribe border?