My prediction is they succeed in the plan to take the town from Guwon and the hounds (or partially succeed maybe), but they don't kill Guwon. Jinwoo (maybe in secret) has him locked up and tries to re-educate him to value human life, but Guwon continues to insist that everyone but Jinwoo are dogs to him. Jinwoo eventually gets fed up and starts getting violent, maybe even torturing Guwon. This makes Guwon love him even more and uses it as evidence that they really are the same. I don't know what would happen after that, but part of me thinks it can't really end unless they both die.
My prediction is they succeed in the plan to take the town from Guwon and the hounds (or partially succeed maybe), but they don't kill Guwon. Jinwoo (maybe in secret) has him locked up and tries to re-educate him to value human life, but Guwon continues to insist that everyone but Jinwoo are dogs to him. Jinwoo eventually gets fed up and starts getting violent, maybe even torturing Guwon. This makes Guwon love him even more and uses it as evidence that they really are the same. I don't know what would happen after that, but part of me thinks it can't really end unless they both die.