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! Forbidden from contacting Hak and the Four Dragons, Yona sneaks out of her room at Hiryuu Palace! But when she comes face-to-face with Su-won, what words will she have for her father's murderer? Later, Yona uncovers some past mysteries about Su-won's parents!