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I didn't get that he misses Cain at all from that. From a writer's standpoint, and just from the way Jooin is, it was more that he felt some guilt possibly facing Cain after being with Yawhi, or even just the space he shared with Cain. As though it were a betrayal to what he sees as Cain's openness towards him (although I still think he's hiding something). Or maybe that he didn't miss Cain per se, but he didn't want to go home to an empty house to be alone with his thoughts, which is far more plausible. He just took in a lot of information that's hard to process. As Jooin is a social creature by nature, being alone to sort it out would not be what he wants. Instead, he wants to be with people that put him at ease and distract him so he doesn't have to think too hard.
JEUWJWISJ BRO JOOIN MISSING CAIN IS SO ???? MAN LITERALLY DOESN'T WANNA GO HOME CS CAIN ISN'T THERE TO GREET HIM WAT THE HELL THIS IS SO FUCKING CONFUSING