The king may have been ignorant to Cain and Llyod's relationship. And maybe Cain is only somewhat loyal. The King wanted a trained and loyal soldier who would follow all orders, not someone who might not do it.
Thanks for the translation.
I am reminded of Pleasantville when the MC doesn't appreciate the choices he made profusely changes the story, including getting the interests of a girl meant for another.
He is confessing to a scheme and was beaten. It raises the question as to what he was scheming. . That these teens are trying to stop him from executing the other lord, it implies he is doing something illicit to achieve that outcome.