I doubt the mc will believe him even if he sat him down to explain given how devoted he is to his hyung
Yup. Especially in the novel, the pack loyalty of dogs is highly emphasized. For an abandoned dog like our MC, he actually feels guilty for staying with the ML when he failed to do his job and assumes that his hyung is now in trouble because of his failure. For him, the betrayal is to his hyung and the dog clan who raised him.
I wonder why his hyung didn't inherit that pack loyalty
I really hope he catches him before he leaves and sits him down to explain everything. It'll hurt him but he needs to know and it's better than him returning to that douchebag of a "hyung" and getting sold off ╥﹏╥