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!

Yellow Dragon Zeno has sealed away the other three dragons in the Chalice of the Four Dragons' Blood. He tells Yona and Hak that he wishes to return the four dragons to the heavens and end his life. But is this heartbreaking farewell truly the end of the dragon warriors?