Yona of the Dawn (2014)

Yona is a princess who lives happily in the palace with her father and friends, oblivious to the misery of the kingdom. But the day of her sixteenth birthday her life changes: the emperor is killed. Yona has to run away to survive. She'll be helped by her friend and bodyguard, General Hak. Together they embark on a journey to find and ask for help from the four dragons of the legend. During the adventure, Yona observes the kingdom and opens her eyes, determined to become a princess who helps her people.