I am always wary when I start a new Thai BL drama, because they vary so wildly in quality - This one is definitely on the high end of the scale.

The target audience is definitely much younger than me, but I liked it.

Technical aspects of the production were fine. Overall, the acting was good, especially since the actors are all really young. Directing was fine also -- I always have an eye on how ensemble scenes are done, and I did not notice anything missing here.

There are quite a lot of songs in the series, which is appropriate, since it's about a band -- not too many (and that's coming from me, who thinks that there's too much singing in Disney movies), and all of them fitting the band's general vibe and the plot.

Regarding the plot, it is a slow burn with lots of pining, and I tend to love this trope. Yes, it's a bit ridiculous at times, and also a bit cheesy, but that makes the series so charming. Even though some more serious issues are addressed, it's never high-stakes for the audience.
A lot of the good tropes are used liberally, some are there just to be subverted (an episode at the beach, but the young people get only five minutes to actually enjoy it?) -- and there are none of the trope I hate (e.g. miscommunication because some character is lying, love triangles, traumatic childhood experiences, jealous female characters...).

I also loved that there's so much time dedicated to the bandmates' friendship and the highs and lows they go through as the school year progresses. They are all young boys who enjoy life, and are not ashamed to act silly when they feel like it.

The parents also got some character development, and enough time to show it.

There really only two very minor points that could have been better:
a) I wish there were more female roles. I know it's a BL, and BLs have to have a majority of male characters, but why not have a girl in the band? Or a female Kajorn? Or female MCs? Or a female Yak? (Though, I admit, the last one is maybe a bit more difficult.)
b) I would have liked to see a bit more story for Tinn, whose main role is to support Gun, his love interest. He does have his own insecurities, his own questions about his future -- it's all already there, just underdeveloped and glossed over.

One last thing, because I waited for it but it never came: There is absolutely none of that old and tired top/bottom-dynamic in this show! None of the boys have any characteristics that trope would demand (difference in age, status, experience, body type etc.), none of the "pushy top" and "reluctant bottom", their body language and whole demeanor are always "typical boy" and touches are very much mutual and equal in reciprocation. I hope we'll get to see more of this kind of relationship dynamic in future Thai BL shows.
(They even make fun of the trope at the end when they talk about ship names!)
So that was a very nice surprise.

All in all, the show is light-hearted and funny, even silly at times, with great friendships -- it made me smile throughout the whole series. So I recommend it as something to watch on gloomy days. Characters don't take themselves too serious, and the audience should do the same.