This is my first review on here so I really hope it's not crap. Haha, anyways;
This show is honestly by far, one of my favorite Thai series, if not one of my favorite Asian series as a whole (& I've seen A LOT of Asian dramas!)

Though I love this show so much, I'll start with what I would call the negatives.
To me, I found the side story of the professor & the student quite bland & uninteresting. I actually skipped most of their scenes. I usually dislike teacher/student stories for obvious reasons, but this is different seeing as he's a college student, she's not much older than him, & he's indeed of age. So that didn't bother me. It was mostly just the character of the professor. I don't know why, but her personality was quite annoying to me, like I found her to be somewhat stuck up & obnoxious. I'm not going to spoil anything so I'll just say that I get why she's so against what she's against, but just something about her really annoyed me. (I think she's incredibly gorgeous though!)
I found FarmxBright storyline quite awkward too. Not so much as the age difference as most people seemed to be against;  Farm is of age & CGame (the actor who portrays Farm) is 21, & as someone who is 22 yet still looks like a 16 year old, I understand that he can't change how young he looks. But what bothered me is the development between the two characters. Again, no spoilers, but the ending was quite odd. In all honesty, I would find it interesting if season 3 was to happen, that they'd focus on them.
One last thing is the continuity from season one since this is supposed to be a prequel. There's a few things that are different from the first season. I actually found that the characters personalities are quite different than from season one too. It's not the hugest of issues, but I just thought it was a little weird.

Other than those few things, I didn't really dislike much. A lot of people seem to be against Knock's actions & his way of thinking. I however, get it. Knock feels guilty for both relationships he's dealing with; one more than the other because he sees the person of that relationship to be innocent & doesn't deserve what's going on. Obviously how he deals with it isn't exactly the right thing to do, but hey, it's angst & adds to the story.
More positives about the show is definitely the acting & chemistry! Those who have seen or at least started the show know the main actors have incredible chemistry. Literally the first scene from the first episode shows it. Every scene between them was so surprising, but in the best way possible. As someone who has always wanted to be an actress, I tend to pay a lot of attention to facial expressions, body language, tone of speaking, chemistry, etc. & I was not disappointed one bit. This goes for every single actor. Even the smaller roles did a fantastic job. The villains did excellent as well! Of course I disliked every bad guy, until some of them redeemed themselves. (Won't say who  or how so this doesn't count as a spoiler!)
Of course Yihwa was my favorite character. Not just because she's super cute & spunky (Maengmum is such a babe!) but because she truly cares about her friends. You can tell she loves them dearly & just wants them all to be happy. The fact that she does so much for her friends is so heartwarming to me. Everyone honestly needs a Yihwa in their life! I absolutely adored Fai as well. I wised that she was a bit more involved in a way. Not in the screen time sort of way, but in the kind of way that Yihwa was. I feel like Fai (along with Phu for that matter) were kind of in the dark with a lot of things & I would have loved to see them be a little more involved, if that makes sense at all.

This is a very long review, I'm so sorry! But to wrap it up, I'll say this; I highly recommend this show! Even if BL dramas aren't your thing, this show has so much depth that you don't often see in dramas, let alone in BL dramas. I won't name any names, but there have been quite a few shows I've seen that seem like they're just supposed to be really fluffy or really angsty, but in a way that drags & just has messy plots.  A lot of those shows don't have much depth which makes the whole show seems to lack a lot. I don't want to put down other BL dramas, but this specific drama seems to have so much that others seem to be missing. If you're wondering on if you should give this show a shot, PLEASE DO. I really don't think you'll be disappointed!!