Spoilers
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It's not rlly a redemption arc but it does affect ur perspective of Yohan (a lil). While juns character remains the same (if u meant his personality. However, his attitude towards yohan does change for a while), he is more tolerant. Their dating arc is rlly cute (after the main story ends).
Did we read the same story?
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Mmhmmmm
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Yohan already had feelings for Jun and was offended because Jun never acknowledged his existence and only ever had his eyes on that unrequite-love-guy(I forgot his name). He was really very upset about that and that's why he's being an ass now. He is just so petty.

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Sorry to say at this point Yohan doesn't have feelings for Jun. And this is the most draw back point for me in this novel. I was so surprised.. during whole school life he was just having fun.messing around with Jun. He thought Jun as a bet..whether he could seduce him or not.
My whole life was lie.
I thought atleast he was acting however he is bcz he felt jealous or something. All this acting just to have it with Jun.. WOW