Son Hak - Yenra Picture Wiki
Son Hak (ソン・ハク Son Haku) from Akatsuki no Yona is Yona's childhood friend and servant, as well as the former general of the Wind Tribe.
Son Hak from Akatsuki no Yona - manga version
He is known as the Thunder Beast for his astounding fighting skills that were said to be unrivaled by anyone, earning him the title of the strongest soldier in the Kingdom of Kouka. His talent had already been recognized since he was thirteen years old and he was the first person to become a general at such a young age. He was an orphan and adopted by the previous Wind Tribe general, Son Mundok, as his grandson. He is fairly calm and nonchalant, and likes to occasionally tease Yona at every chance he gets, albeit deep down he actually cares for her very much and vows to protect her at all costs. It is demonstrated throughout the story that Hak's feelings towards Yona stem from more than just being her servant, but because he loves her. He used to be a good friend of Soo-won's and wanted for Yona and Soo-won to live happily together, and even hoped for Soo-won to become the king with him as his right-hand man, but this soon turns into hatred when Soo-won betrays them. Hak even attempted to kill Soo-won the moment they were reunited face-to-face at the Water Tribe village. In combat, Hak uses a Hsu Quandao as his main weapon.
Voiced by: Tomoaki Maeno, Ayahi Takagaki (young)