Ju Haku was an elderly man, with long hair, arranged in a top-knot, a goatee and a long mustache. His eyes were constantly shut and he had freckles on his cheeks. His attire was that of a Qin's official.
Despite his calm manor and his old age, Ju Haku had full awareness of the nature of politics. He was truly loyal to Sei Kyou, going even as far as sacrificing his own life to protect him.
Ju Haku was the man responsible for Sei Kyou's education during his younger years. As the prince grew up, Ju Haku continued to support him, as his adviser and a member of his faction.
Ju Haku followed Sei Kyou in his campaign to defend Tonryuu from the Zhao invasion. Along with his master, Ju Haku fell victim to Ho Kaku's scheme and was imprisoned. When, Sei Kyou escaped he followed him in their attempt to find Rui and restore their name in the king's eyes.
During their search, they came across some soldiers of the Subjugation Army, who thought that they were the true culprits behind the rebellion and attacked them, in order to receive the reward pending on their heads. Ju Haku fought along with his lord, but was killed as he attempted to protect him.
As the teacher of the prince of Qin, Ju Haku must have had a great extend of knowledge. Furthermore, he had an eye for politics, as well as some influence in the court, as he was chosen by Sei Kyou himself to be one of his closest advisers.