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Idk but yahwi arc is the one that looks completely done from the looks of it. Especially after Zzinbam said Cain present life will show up more. Jooin already said that nothing can happen with his relationship with yahwi because how deep his wounds are by him and that his trust has been broken. While with Cain there's this a misunderstanding between when after this separation.
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Look I understand where you're coming from. But a "character arc" is actually a progression used in storytelling that ends in a resolution. Cain's character arc has been completed within the confines of the story. Yahwi's has opened with the story's start but has yet to be resolved, and Cain's has started and resolved within the confines of the story. Analytically this means that Yahwi would be the endgame by process of elimination. If you are interested in looking up the steps of a character arc you can search it on the Internet. Author nim probably means Cain will show up later on in an afterword or in another regard, but not as a love interest. I studied literature at university.
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The only reason his seems biased is because his arc was meant to be completed within the story (which it was). Yahwi's stretches longer and encompasses Cain's, so it takes longer. He also has higher stakes than Cain's, and a higher payoff. Cain is presented as the safe choice, and therefore has an easy and clean arc. Yahwi is the harder choice, with a longer arc, and a better payoff in the end. Not every reader realizes this though.
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I wish your right... i dont want to get my hopes up but
Considering this info you gave it kinda makes sense. if its cain its cain and it wouldn't take this long if it werent for yahwi. Its yahwi slowing everything down since he has conflict with jooin but they recently had an agreement not to bother each other anymore but their departure was bitter. i hope the author wont leave yahwi a bitter ending. Many people might disagree but i think no matter what kind of person he is there must be progression or i might have been rooting him for nothing smh
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There's no resolution to Yahwi's character if Author nim leaves his story like that. With how they resolved Cain's story so well, I doubt they will leave Yahwi with a bitter story, especially considering we have learned so much tender moments about his past and that he has learned from his mistakes. He has yet to fully descend from the literary character arc, Author nim seems to know how to write one properly, so I don't think he'll have a bad ending. The only people that disagree with Yahwi getting a satisfactory ending are the people that don't understand storytelling and just find problematic male leads in manhwa, find one reason to hate them, and then stay mad at them for the remainder of the story even though authors spend a hundred chapters showing them go through a full arc to present them as changed and redeemed
Unfortunately I'm older than I care to admit and I can say I've studied enough literature to say that Cain had made his full character arc. Yahwi's is still incomplete. At this point I would theorize that Yahwi is, indeed, the endgame.