Responses
Because Jooin rejected Yahwi after seeing that Yahwi didn't live up to his promise that he would change and things would be different between the two. Jooin had sex with Cain and told Yahwi that he slept with him and that he's still selfish. Yahwi is now under the impression that he and Jooin are over for good.
And now Jooin is confused and acting out because he still has feelings for Yahwi. He took it out on Cain because he's looking for a reason to lash out by accusing him that he doesn't talk about things with him.
Is it just me or do they all seem out of character? Like their behavior and actions don’t really align with each of their personalities that we’ve known. Like why is Yahwi suddenly so sentimental and Jooin has less patience than usual.