Kai Lan is Jiao Cheng's bodyguard. He has a giant body and massive strength that makes him a deadly foe, and his mouth seems to be full of sharp fangs.

Xin is a war orphan in a poor village in the kingdom of Qin. He has big dreams of becoming a great general, and when his best friend’s life is cut short by political machinations, Xin sets off to find a deposed ruler and help restore his place on the throne, while working his way up through the ranks of the Qin kingdom’s army to do what no one has ever done before—unify China.
 
(Source: VIZ Media)

When low-born servant boys Piao and Xin set out to become the world’s greatest war generals, they quickly find themselves caught up in a violent struggle between two noblemen plotting to overthrow the King. After Piao is killed protecting the rightful ruler of the kingdom of Qin, Xin sets out on a campaign for revenge that leads him straight into the fire of war. 
 
Now, with a target on his back and an army of enemies standing in his way, it will be up to a boy with no name and a young king without a throne to return order to their war-torn country in this historical action-drama based on the Tezuka Award-winning manga, Kingdom. 
 
(Source: Funimation) 
 
Note: The first episode aired with a runtime of 50 minutes as opposed to the standard 25 minute runtime.

The third season of Kingdom. 
 
Following the successful Sanyou campaign, the Qin army, including 1,000-Man Commander Xin, inches ever closer to fulfilling King Ying Zheng's dream of unifying China. With a major geographical foothold in the state of Wei now under its control, Qin sets its sights eastward toward the remaining warring states. 
 
Meanwhile Li Mu—an unparalleled strategist and the newly appointed prime minister of the state of Zhao—has taken advantage of Zhao's temporary truce with Qin to negotiate with the other states without interruption. Seemingly without warning, Ying Zheng receives news that armies from the states of Chu, Zhao, Wei, Han, Yan, and Qi have crossed into Qin territory. Realizing too late the purpose behind Li Mu's truce with Qin, Zheng quickly gathers his advisors to devise a plan to address the six-state coalition army on their doorstep. For the first time in history, the state of Qin faces complete destruction and must use every resource and strategy at their disposal to prevent themselves from being wiped off the map. 
 
(Source: MAL Rewrite)