Just tell him sweetie i hated him but he's also suffering now, i think he kind of deserves an explanation about why you're acting like that, you've grown a lot but you seem to be still stuck in your past, nothing great will happen if its like that. Never focus on the past and future baby girl, the present is what's important since your actions today will always leave a big impact. He's literally genuine and in love with you accept that fact and face him with honesty.
Where can i get a Kisung anyway- people there really haven't heard of a glow up and it shows, and it's really toxic how they insult and bully someone because they expected her looks to be perfect just because she's a daughter of a certain someone tf