Keith Kogane was the son of the guard who protected the royal Altean family. In order to keep peace between the Galra race and the Altean race, Keith would have to marry Princess Allura. Even from a young age, Keith knew that what he wanted wasn't Allura, but her brother, Prince Lance
Before the Kerberos mission, Keith and Shiro have had a stable kind relationship. When Keith thought Shiro died he lost his world was ending... But now he has him back, but it's not the same, keith feels less for Shiro but more for another... And hides his dirty secrets...