Honestly I kinda get why heesu is like this cuz if it was Heesu and I forgot what the orange hair guys name but it it was them two seung woo would get jealous too but other from that u think they just need to talk stuff out tbh :

guys the reason they haven't posted new chapter on her cuz the artis for after school lessons for y ripe apples is on Hiatus it says it on WEBTOON with this series :3 sigh but still I hope they come off hiatus soon