Responses
PLEASE look back at the chapters where Cain made those faces or his "eyes" as you say, it's so obvious he was asking them toward Yahwi. It's not a secret Cain doesn't like Yahwi which is bc of the way he treated and made Jooin feel. Cain has never made an angry face toward Jooin it was always directed at Yahwi or the thought of him
Truth is, I think Jooin would be better off single ! Yahwi is a piece of trash and Cain is OBVIOUSLY a creep (have you seen those eyes when Jooin’s not looking ? Also I really didn’t get the "master" thing...).
I really hope neither of them is the endgame. Even if Yahwi gets character development he acted like a dick and this can’t be forgiven by the excuse "we knew each other when we were kids" -_-‘