Yahwi and Jooin's relationship is all about sex and too boring. But Cain have something different...
No literally. They actually have a bond, Cain likes JOOIN for JOOIN. But yawhi?? That’s a different case don’t know about him.
maybe because Cain was a dog in the past, he is so loyal to Jooin. Yahwi and Jooin also met when they were younger, but Yahwi's actions became too nerve-wracking.
Painful...