If you watched 2moons you will recognize the actors Kimmon, Copter and Bas.
Though I personally liked them more in Gen Y the series where the mains are not Pha and Wayu as in 2moons but instead it focuses on Mark and Kit, who appeared in 2moons as Ming and kit, and as the support couple.

Story: I think the story is fine, nothing amazing or extraordinary but just fine. Mark is the best friend of Wayu who is dating Pha, who’s best friend is Kit. Mark catches an interest in Kit as soon as he lays eyes on him and decides to approach him. Kit at first, doesn’t seem interested at all but more annoyed.
Yet, as time goes, the change and growing trust for each other is visible and interesting to watch. Their relationship has a good dynamic and it will become clear that they somehow go well togther despite being so different. As they bicker and argue a lot, their sincerity and care for each other is there.

Acting: Their acting is pretty well performed. Kimmon and Copter are both actors from earlier and no beginners. I can also see they really improved a lot. They capture their characters well as the handsome and charming, yet deep caring Mark and the tough and clever Dr Kit. Their characters are very different but if you're open for it, you will grow to understand them both. Coming to their chemistry, it's there and have improved a lot as well.

Extra:
I think one of the best things about this serie is the fact how being “something else than straight” is seen as something so normal. And yes, it is very unrealistic I know, and I do think it's important to reflect reality in dramas but to be honest, that part was still realistically performed. I know that it would never happen in reality but wishing is free right? And I do wish it was like this in real life too. Even if it is far from reality "being not straght" is something that should’ve been normalized long ago. There are no struggles with the thought of being gay or even about sexuality at all. They just like someone, a person, and isn't that enough? Mark and Kit doesn’t seem effected by liking a guy at all and none around them seems to look at it as something unusual either.

EDIT (finished it):
So I finished the serie now and first of all I wanna say, this serie started off really well but what actually happened towards the ending? Despite that I can say now that I will watch season 2.

After Markkit got together they had some happy moments that gave me a happy feeling as well. Towards the end their story sort of ended and they became a support couple while the main focus started focusing on the love triangle for Thanu, Wayu and Phai. For me it was hard to decide who to ship with who because the dize did not get thrown for a while, some of them were just lacking personality and it all could feel very dragged out sometimes. Their story got boring sometimes because it just moved too slowly or felt too dragged out from time to time. Some of their scenes were too slow or just straight up unnecessary. Despite their love triangle drama they were all kind people and deserved good (especially Phai, such an angel honestly). I hope this gets clearer in season 2.

We also get to follow two other boys, this was a sort of "hate-yet attracted to each other" relationship with some real serious tension. Two of Sansab's friends, Pok and Tong. At first I wasn't that interested in their story because their story literally came from nowhere. But it did get a bit more interesting later on. It was too toxic for me sometimes though which I didn't like but in the end, what got me stuck was probably the excitment in their tension. It was on a surprisingly high level and I could feel their insanely strong hate yet desire for each other if that makes sense? I really hope this gets cleared up in season 2 as well.
About Pha... I understand why they hid his face in the beginning. At first I thought it was because they could not include Pha's original actor God, but it doesn't seem like that now when Big has the role. Pha's sudden return though... no. I don't like that, it's the least they need now tbh.
The end of this season 1 left me with a lot of questions. Now all I can do is wait for next season.