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! An earthquake suddenly hits the Village of the Blue Dragon, and Yona and her friends are trapped! Yona manages to escape safely with the help of the Blue Dragon, and she asks him to join her., Meanwhile, Gija senses the presence of the Green Dragon!