I really don’t understand this even after going back to earlier chapters.
The author hint it in the previous chapters but later on in the story, they announced that Cain was actually dog in his past life which would explain his name, why he calls Jooin "master" and that he's used to sleeping on the floor. And if you look closely on the cover of the book...Cain is wearing a dog collar.
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" -_-‘
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
I’m dying for a sex scene with Cain