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Yona of the Dawn

2000 years ago, the fictional nation of Kouka, drawing inspiration from a mixture of Japanese, Korean, and Chinese cultures was founded by the Crimson Dragon God, who came down to Earth from the Heavens as a human, deemed the Crimson Dragon King. It was believed that humans were living in an era full of evil and thirst for power, where they forgot about the Gods. The Crimson Dragon King was eventually forced to fight against these humans, and just as he was about to be killed and the world was on the brink of extinction, four other Dragon Gods, imbued with the dragon blood, joined his side as human warriors, and helped him lead Kouka to prosperity. After they had cleared Kouka of evil, the Crimson Dragon King died. The four Dragon warriors mourned his death and walked separate ways from his castle, leaving the country to develop over the centuries into 5 Tribes: Sky, Earth, Water, Wind, and Fire. As countless generations flew by, this history became a famous founding myth.

2000 years later, the story commences with Yona, the sole princess of Kouka, ruled by her pacifistic father King Il under the Sky Tribe. Yona lives a lavish, sheltered life from the harrowing reality outside of the walls of the Crimson Dragon Castle, protected by her bodyguard Hak, general of the Wind Tribe, and often visited by Su-Won, her crush of 10 years and the son of King Il's brother, Yu-Hon. But contrary to this peaceful illusion, Kouka is once again on the verge of destruction and about to undergo a political upheaval.

A week before a party celebrating her sixteenth birthday, Su-Won visits to pay tribute to her. Upon revealing her intention to someday marry him to her father, Yona is shocked and dismayed when King Il pointedly forbids her from choosing Su-Won as a husband. On the night of her 16th birthday party, Yona visits her father's chambers again, determined to change his mind. Instead, she walks in on Su-Won driving a sword through King Il's chest, revealing that he'd planned a Coup d'état and would become Kouka's next King. Yona and Hak become fugitives and are forced to flee to Fuuga, the capital of the Wind Tribe. Under the suggestion of Hak's adopted grandfather and prior Wind Tribe General Son Mundok, Yona and Hak search for an exiled priest who tells her about the Crimson Dragon King and four Dragon warriors who unified the nation. Guided by this seemingly fictitious myth, Yona begins a journey to find these warriors in order to survive and save her country.

(Description from Wikipedia)