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!

A large fleet of ships from South Kai heads to Sensui at drug trafficker Hyo's behest. Will Yona and her friends be able to thwart Hyo's nefarious plans and stop these enemy forces? And what will happen to Yona when an infuriated Hyo attacks her?