the dog was the MC for being stupid, gullible and naive, and the scum is the FMC for being a liar and a whore (also the "best friend" who're just douchebag)
the dog was the MC for being stupid, gullible and naive, and the scum is the FMC for being a liar and a whore (also the "best friend" who're just douchebag)
But the childhood friend was obsessed with the MC and had feelings for him like a dog, while the MC eventually killed him and took his girl like a scum. I think the title is clever because it could apply to both of them.