Kain is a wandering stranger, he travels through prides in search of new acquaintances, strengthening ties between prides and in order to hear more legends about the great kings of the past.
After attending the Kamo pride, he was left in a bad place due to conflicts between him and the Kamo king.
What is the reason? Kuin (Kain's father), according to my previous description of one of the art ( Father with son [my characters AU] ), was familiar with Mufasa. And because of the legends, Kain heard pretty well about Scar, who is Kamo's distant grandfather.
Kamo does not like him, and hates when all his bad deeds are attributed to his character, but sometimes he remembers him.
Kamo has a rich ancestry, his longtime grandfather is Scar, who managed to overthrow Mufasa from the throne. Some of the dictator's share from him went to the massive lion, for example, as facial expressions and a slight similarity of colors. This is the opinion of wandering lions and lionesses who did not receive proper help from Kamo for their boorish behavior.
Kamo is a rather patient and kind lion, not evil, but patience can also run out sometime.

Kain and Kamo are somewhat similar to each other .. after all, they both love different stories from old lions who have seen life.
And yet their aggression towards each other was due to a misunderstanding.