I enjoyed this series a great deal. I especially liked that, for a change, neither of the lead couple (Pete/Ae), used the "I'm not gay, I don't like men, I just like you" line, which is so overused in many BLs.
The characters were pretty varied and included a straight couple, which was nice, as this makes it a more inclusive story, although being a BL series, of course the emphasis should be on the gay couples.
This is a fictional drama, not real life, but some of the characters were really unlikeable and their behaviour was not shown with either the consequences or reprisals, they should have faced...
Lemon, Can's sister; what a nosy, bitchy, controlling, unpleasant character. The crap this character made up about those around her, with no thought for the havoc it might cause in their lives, was really irritating. Considering Can is meant to be older, I found it really annoying that she seemed to have so much control over him.
Kengkla was another horrid character; a real sleaze. He basically low-key stalked Techno via the latter's equally shitty brother, who seemed to have no conscience or problem selling out his brother's body (basically) for personal gain. Awful. Kengkla only got the opportunity to bed Techno whilst he was drunk. Admittedly, Techno did kiss him back. However, the next morning, Kengkla made out it was Techno who took advantage of him! So uncomfortable and totally wrong to have left that part of the storyline without any reprisals on Kengkla - a season 2 much needed, if only to rectify that!
Let's not kid ourselves, even with an 18 cert, there will be underage, or older but immature/inexperienced/easily led viewers...as this is not a 'serious' drama, but a lighter hearted series, those kinds of issues need to be clarified as not being acceptable under any circumstances.
The ending in terms of Tin and Can's (very unfortunate names for English speakers ;) ) characters, was really frustrating. I felt so sorry for Tin, whose character developed well through the unfolding of his story. Last we see of him is bawling his eyes out in the shower. Nice.
Can had started to develop so well as a character too and again, we were left with him being so wonderfully open and honest with Tin, yet not seeing that taken any further. He was equally upset, as he knew he'd hurt Tin, even though it was not intentional.
A Season 2 is definitely needed, focussing on the characters that were secondary in Season 1. I don't think Pete and Ae's characters need any further development, as they were solid and very much together at the end of S1.
I would recommend watching this series and did enjoy it, as said at the beginning. These gripes are just my personal and humble opinions! I really hope there will be a follow-up series.