English Voice Actor: https://www.youtube.com/watch?v=IKKxpIjIVLA

Hak is the main hero and the former General and Chief of the Wind Tribe. He is the adopted gran son of Son Mundok, the adoptive brother of Tae-Yeon, and the childhood friend of Yona and Soo-Won. He is known throughout Kouka as the "Thunber Beast" due to this outstanding fighting skills. He helped Yona escape from Hiryuu Castle after her father was murdered by Soo-Won. 

This is a character that fights a lot within the manga and you will need to make grunting noises and sound exhausted at some points. 

Hak is a mischievous and loyal person who strives to protect Yona at all costs and has been shown to be self-sacrificing, both physically and emotionally, when it comes to her well being. His professionalism extends to a point where he addresses his childhood friends by their status. His devotion to his job stems from his belief in Emperor Il. At first, he had no intention to get involved in the royal family, as he saw it as troublesome. However, when he witnessed the emperor’s bravery, he swore loyalty to them, seeing that he couldn’t leave them alone.

When it comes to his heart, Hak destroys his impulses every time they resurface, even though it hurts to do so. There are times that he will show his affection with teasing, but not much beyond that. However, when someone (particularly Jae-Ha) questions the emotional distance between Hak and Yona, Hak loses his composure and can become territorial around the princess. He seems cold around Yona at first, but slowly reveals that he truly cares deeply for her.