Yohan calls Jun his god and takes an acid hit for him and everything becomes okay. Then they get together. Yohan never apologized for his behaviour during the time he bullied Jun by breaking his arm (he never even acknowledged it). So yeah, asking for redemption arc is foolish when Yohan never even asked for apology
He didn't even show any worry for Jun when he saw Jun's sole pierced by glasses

to anyone who's finished the novel, is there a good redemption arc?
I honestly enjoyed the first season a lot and although I know no redemption arc can make me feel the way i used about yohan I still want to continue reading for jun.