Check chapter 1, his adult version was already shown there.
it's also like, he suddenly got a looot sexier in the middle of the season. Is it because he was still growing? lol
Or the artstyle got better? :' idk
Maybe, lol Hee-seo's sooo sexy already even as a 19-year old kid haha Damn, when when he first did it by the door, it was just
Wait 19yo cant be a kid:'
Lmao true XD
It just got so exciting! I really want to know what he looks like as an adult, I hope he looks sexier now (〜￣△￣)〜 but i am happy that the one is alive (≧∀≦)