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God.. this is so sad i'm crying. Cain has been hold for so long. No matter how jooin treats and hurts him, he never left him. He kept his promise from their 1st life. He left for jooin happiness coz he don't want to put burden on jooin anymore. Usually he would stays even how much rejection he gets but he finally left after saw how miserable jooin. He couldn't take it if he's the one who make jooin feel so. He's really a selfless guy. I know he was a dog and a dog is loyal until the end of their lives. But i still hope Cain will be happy... He deserves to be happy..