Excuse me? Is he the one who had done JK wrong?? This is victim blaming.
But yeah, he should've had a change in character. He should be more selfish, more self centered, he should've fought for himself more. He wouldn't have had to deal with that old perv or JK himself.
But if you think he is the reason this manga is problmatic because he is kind hearted? You should revisit your mindset.

Just realized it isn't jaekyung that makes this story bad, it's kim dan. Like wdym we both weren't perfect. Yes y'all not perfect buttt at the very least jk had a sembalance of character development, kim dan on the other hand got the rofan shojo manga female lead bella swan treatment, zero character development.