WOO okay so:

For side characters, my favorite would probably be yonghui or jungwook. Yonghui because she was literally miae's first friend at the academy and she's such good friends with her, I love their dynamic so much :,) Jungwook probably because he's one of cheol's best friends and he's really nice and supportive but also pretty silly and mischievous. For my least favorite it would probably be taeuk,,, GET OUT OF HERE!!

For chapter, my favorite would probably be chapter 48. Mostly because it has a lot of sentimental value (that's when I caught up to aslfua for the first time) PLUS it has one of the most monumental scenes out there (can't you just be a little nicer to me?), it kinda changed the trajectory of their relationship methinks... but ofc I do have to put chapter 138 AKA CONFESSION CHAPTER because it genuinely changed the whole world... no explanation needed. For my favorite arc, I literally think all of them are so good so I can't choose a favorite LOL but I have a soft spot for the soccer arc, it was so silly and fun, but also the silly flirtation arc post confession is also so good and miae’s birthday arc? Absolute cinema… the folk dance arc, the secret studying romeo and juliet arc??? The movie day…. (let me stop now before I list every arc…) For least favorite, I don't really have a least favorite chapter, but for arcs, ummm probably this latest arc? Personally I don't have that many issues with it, but because everyone seemed to have a bad time with this one (completely understandable, everyone has their own taste!), it kinda tanked my enjoyment of this arc too. But also maybe the pervert one just a bit, LOL it makes me embarrassed to read it haha but it had an amazing pay off

For theories, my favorite theory is the mountain spirit one, it makes a lot of sense and honestly putting together all the pieces of it feels so satisfying, props to whoever came up with it!! I never anticipated that aslfua would have a sort of fantasy element, but this theory opened my eyes and makes me hyped LOL For least favorite theory, its that cheol is gonna move back to the countryside. Mostly because it would be very sad but also it would also be kind of a weird ending to aslfua. This might be controversial but I don't like the idea of miae moving back to the countryside with cheol either.

For my favorite plot twist, it's probably the Romeo and Juliet plot twist, where it was revealed that cheol and miae have been studying in secret together and that cheol gave her that hair clip! OH and idk if this counts as a plot twist, but the subtle reveal that cheol throws eraser bits at her window to get her attention, and he did that when she ignored him for a day LOL For my least favorite, it's probably taeuk being the guy that hangs around the academy (if it really is taeuk, although I'm pretty convinced its confirmed to be him), mostly because that makes me sad too... begone foul beast!!

My favorite cheolmiae moment, you simply CANNOT make me choose!! There's the moments where they defend each other, and call each other friends for the first time, the water fight, the accidental kiss, the REAL KISS?? the times where they try to tell each other what they mean to each other and the times where they fail,, the confession,,, the flirting afterwards???? guys come on. I don't even think I have a least favorite, they're all so lovely to me...

And thats all! I feel like my answers are not the most accurate to my feelings because there may be some things that’ll come to my mind later… But i hope you enjoyed reading and sorry for the essay lol… TLDR, i love aslfua ^-^