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's attempt to reunite with Jaeha and Sinha takes a horrible turn--both dragon warriors have turned into dragons, and Jaeha even vanishes before her very eyes! Back at the Kohka camp, Sinha fights for his life as the soldiers fearfully attack the rampaging dragon before them...