Let's talk about the first half of the series:
Sarawat is supposed to act as Tine's fake boyfriend, which btw is dropped in favour of "flirting" ("wooing" would be a better translation) -- but where are the sweet gestures of love?

Until the second half of episode six, Sarawat only looks either bored or annoyed. He never looks as if he's interested in Tine, faked or not. If I were Green I wouldn't buy it either.
I only knew he would be the main love interest because the synopsis told me so. Where are the feelings? Where's the pining? Sarawat's side of the story is only told in episode 10 or 11, which is too little, too late.

Tine, the self-proclaimed "Mr Chic-Chic" is (almost aggressively) heterosexual -- his only interests are girls and songs from one band. Even when he tried to dissuade Green from pursuing him, he starts to flirt with girls in front of him and Sarawat. If he's so certain of his sexuality, there should have been more of a struggle or at least emotional imbalance until he accepts his own feelings toward Sarawat.
I had hoped the "gay for you" trope had died a silent death some twenty years ago but it seems it's still alive and kicking.
Also: Even though he's supposed to be a good cheerleader, we only see him standing around in one pose (and even that plot point is dropped in the latter half otf the series).

Jealousy is not only the main catalyst for Tine to discover his own feelings, but also the main plot device for conflict in the following episodes, which gets old very fast.

Even when Sarawat and Tine are "together", the only strong emotion they show towards each other is jealousy. No besotted smiles, no casual touches, no hugs, nothing. Where's the giddiness of new love?
They touch each other less then they touch their friends. I'm not talking about anything above a PG level of intimacy, several other BL dramas I love have only one kiss or not even that.

Tine's continued denial of Sarawat's advances make it seem as if he's not actually in love -- except if it's supposed romantic but asexual. (Which would actually be a novel and exciting concept for a romance drama, if done right!) But as the series has established Tine as somone strongly interested in (het) relationships, that can't be it.

I feel that conflicts during the series were never satisfyingly resolved, but just ended with some kind of deus ex machina device. Best examples: How Green stopped pursuing Tine; and the question if Tine's brother would accept their relationship.

Another thing that made me really frustrated with this drama is that boundaries are often disregarded. It starts with Green who gets told repeatedly his advances are not welcome -- and continues anyways. It goes on with Tine, who doesn't stop bothering Sawrawat (doesn't matter if Sarawat actually likes it or not -- what counts is what Tine knows, and Sarawat clearly tells him to go away). It doesn't stop with the side couples -- neither Sarawat's brother nor Man stop their pursuit, even after being told to leave. I can't enjoy a relationship if it feels as if one pertner just gave in to harrassment.

I'm not sure if it's just the plot or also the acting, but directing has definitely a large part in why I could not get into the series. I disliked all of the characters, there was never a moment when I rooted for any of the couples to get together. Small changes in how lovers-to-be interacted with each other would have made it a bit better, at least.

There are other points, I would have liked to talk about the female characters for example or to wonder how they manage to establish top/bottom-dynamics in all four couples without even a bit of handholding, but this review is already long enough.

All in all, I had to stop and do something else every few minutes, since the plot and the acting had me so frustrated. I just finished it because I knew I'd never pick it up again if I stopped. I'm glad it's over.