Chetamja: The King's Eyes

Become a Chetamja! Turn your rage into a weapon that defends the kingdom! When young Gwiyeong loses his family in a brutal Jurchen raid, he swears to hunt down every last one of them. His skill in battle soon catches the attention of King Sejong, who offers him a chance to join Chetamja—an elite force of secret agents serving as the king's eyes and ears in the north. Now, alongside his comrades, Gwiyeong must carry the flame of vengeance and forge it into a blade of duty that will defend the kingdom of Joseon from the shadows. (Source: Webtoon Entertainment)