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So how many people here think Kanki is going to ditch Qin sooner or later?
Well, in real history its said (I only heard passing comment, don't ask for proof), Kanki had fled after losing one of his battles in fear of Sai beheading him. King of Qin in real history is known to be ruthless murderer and was also famous for burying large scale body count alive.
In any case many believe that Kanki fled to another state (Yan)! Huan Yi, Fan Wuji or Huan Ji was a Qin General who betrayed his state and escaped to the Yan State. (source: wiki/Huan_Yi)
Fun Fact: King of Qin is a ruthless murderer (very TRUE) :
So I've read this article regarding details between Ousen and Kanki, there's also a controversy on what really could/might happen to Kanki!
Battle of Fei:
The battle of Fei was the first loss that Ying Zheng(Ei Sei) tasted during his rule. After capturing Ping Yang and Wu Cheng, the Qin army was marching towards the Zhao capital of HanDan. Li Mu(Riboku) was summoned back from Yan Men and ordered to defend Zhao from the Qin invaders. Leading his men from Yan Men, he met up with the HanDan army at YiAn, constructing fortresses and refuse to face the Qin army, waiting for the best chance to strike (similar to the tactic Li Mu used against the Xiong Nu at Yan Men). Wanting to end the battle quickly, Huan Yi(Kanki) led most of his men and attack the castle of Fei Xia nearby. With most of the Qin army out of their camps, Li Mu attacked the Qin camp with half of his army and forced Huan Yi to return. When Huan Yi returned, he was fighting a losing battle as Li Mu coordinated a pincer attack using half of his army currently stationed at Qin camp and the other half from the fortress. Huan Yi manage to escape with a handful of his men and fled. This victory over Qin also earned Li Mu the title of Lord Wu An.
Final Battle against Zhao:
From Intrigues of the Warring States(Zhan Guo Ce), Book of Zhao, Chapter 4:
秦使王翦攻赵,赵使李牧、司马尚御之。李牧数破走秦军,杀秦将桓齮。
Translation: Qin sent Wang Jian(Ousen) to attack Zhao. Zhao sent Li Mu(Riboku) and Sima Shang(Shi Ba Shou) to defend against the invasion. Li Mu defeated the Qin army and killed the Qin general Huan Yi(Kanki).
Courtesy to u/ResV1, we can now finally confirm that Huan Yi(Kanki) did survive the loss to Li Mu(Riboku) in the earlier war and joined Wang Jian(Ousen) in the final invasion against Zhao where he got himself killed.
The Controversy (Now confirmed to be untrue):
Note: Below is the controversy brought up in actual history.
It was recorded that Huan Yi(Kanki) “奔还” after his loss in the Battle of Fei in Zi Zhi Tong Jian, a history book written in the Song dynasty around 1000 years after Qin dynasty. 奔 is translated as “run” while 还 is translated as “return” so i will interpret it as Huan Yi DID return to Qin after his loss. My guess is he was either executed or was demoted to a farmer as punishment as there were no other records about him after this. However, Zi Zhi Tong Jian was a book written 1000 years after the event, so the accuracy is questionable. There wasn’t any records of Huan Yi returning to Qin or escaping to Yan from the historical records before this.
Now let’s look at Fan YuQi(Han O Ki). Nobody knows who he is and why is he a highly wanted man in Qin. All we know is that he was took in by Crown Prince Dan of Yan and was so highly wanted by Qin that it made Qin Shi Huang(Ei Sei), a king who suspects almost everyone, trust a random ambassador from Yan and allowed him to see him in court.
It is understandable why people linked Huan Yi to Fan YuQi as their stories seem to fit very well together, one disappearing suddenly and the other appearing suddenly for no reason later. However, according to some research that some people did, Crown Prince Dan took in Fan YuQi(Han O Ki) around the 17th or 18th year of Zheng’s rule while Huan Yi lost the Battle of Fei in the 14th year. There is at least a 3 year gap in between. So what happen to Huan Yi/Fan YuQi during the 3 year gap?That is if they are even the same person at all.
As we can see from the evidences above, we cannot conclude that Huan Yi is Fan YuQi unless we have more evidence to prove it otherwise. It has been confirmed that Huan Yi(Kanki) and Fan Yu Qi(Han O Ki) are 2 different characters in the manga as of the conclusion of the Rao Ai rebellion arc. Fan Yu Qi in the Kingdom universe is confirmed to be Hanoki, the general who took part in Rao Ai’s rebellion. He will later escape to Yan and offer his head to Jin Ke to assassinate Sei.
Source: https://magaxking.wordpress.com/2015/05/15/ou-senwang-jian-and-kan-kihuan-qi/
Just as what Phenom said Kanki would certainly goes with the flow (for now) especially if it's in his favor and It's up to Hara Sensei to change real history in his masterpiece :