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 her friends have thwarted South Kai's Emperor Chagol, but Sinha, Jaeha, and Zeno are still nowhere to be found. Suddenly, Yona hears the voice of a dragon! But the biggest surprise might be what Su-won reveals to Hak regarding his plans for succession...