I just finished watching episode 12 and I still don't know what exactly did I watch or what was the whole purpose of this show.
Luckily for "Our Days", worse shows like "My Tee", "Don't Say No", "Love Area Season 2", "The Shipper", and "Gen Y 2" still exist and that prevents me from putting this show as one of the worst just because it comes from a relatively modest company with actors that clearly need some help improving their skills. However, this show had some many plot holes (nearly the size of moon craters), so many weird scenes, and so many loose ends that its a miracle its getting a 7.5 average last time I checked. In my opinion, several things ended up hurting this show... here are some examples:

1) The plot:
Can someone explain to me in one or two sentences what the show is all about without resorting to the synopsis provided by GagaOOlala or Atime26? Here is my summary: Mon comes from one of Thailand's provinces and loves basketball but one day, his high school classmate Saint (more on him later) joins the team and takes Mon's starting role... so Mon tired of being a benchwarmer does the childish thing to quit the team and stops playing basketball. They graduate high school, Mon goes to college in Bangkok, he is looking for his friend Pond (also a former high school classmate), ends up meeting So by accident, they kiss while drunk, they end up sharing an apartment with 2 other guys, Mon likes So, So likes Mon, So rejects Mon because he is going abroad forced by his parents, Saint admits he always liked Mon, Mon rejects him, Tim (Saint's university and basketball teammate) confesses to Saint in the last episode, they all play basketball... there are other characters that don't do or make much sense in the plot. Everything happens waaaaay too slow for a 45-minute episode. Mon and So end up together, So goes abroad, he comes back right at the last second. The end.
That's it... the show didn't focus too much on basketball like "You're My Sky" did just recently, as they do play basketball but Mon's team is not that good and Mon and Saint actually play way more basketball on their own than with their teams. The handling of the Mon-So-Saint triangle is quite bizarre... Saint never confesses until near the end of series but you always know he likes Mon. So likes Mon but decides to avoid him for 2 episodes just because he is going abroad (hooray for Thai BL clichés of sending away a character). So even flirts with his cousin (Mon doesn't know she is So's cousin) so Mon feels worse and ends up, yeah, you guessed it, running away again.
Even Mon's younger brother, Micky, also runs away after fighting with his mother and ends up in Bangkok and kissing Q out of nowhere. This was supposed to be the secondary couple? No clue, as their story outside of the episode where Q takes Micky around Bangkok and randomly kiss was the only extended moments they had together. They briefly appear in the flash forward moments near the end of episode 12 and they look like a possible couple but nothing is said. Tim confessing to Saint this late in the show also left everyone without the chance to see if their relationship could develop, especially since Saint accepted the fact that having Mon as a friend was the only option. Again, in the final scenes of episode 12, they are both playing basketball shirtless but nothing is confirmed for sure. The lack of a secondary couple made the plot holes more obvious and put even more pressure on the lead couple to deliver, which they don't do.
The characters are dull and predictable with Mon and So's roommates providing some of the comedic relief, Pond providing some of the sound advice to Mon and So and being heartbroken because Amy prefers the coach and ignores him, Tack acting like an arrogant bully towards Mon but then softening up a bit when So confesses to Mon in front of the team in episode 11 and he does a "thumbs up" sign to So, but then being cold to Mon again in the final episode. We only meet Mon and Micky's mother and So's mother but they provided ZERO to this show despite So's life being completely controlled by their parents who want him to study piano abroad.

2) The acting:
Mhing (playing So) and Gap (playing Mon) are cute, particularly Mhing, but sadly, both need A LOT of acting lessons to improve. I'm sure Gap was instructed to play an expressionless and cold character who barely smiled in the first half of the series... but he took it quite to the extreme with scenes where not a single muscle in his face was actually moving. Mhing was a bit better but the long silences during a scene, almost similar to "Bite Me" (another BL disappointment), made the lack of facial expressions even more evident. The chemistry between Mhing and Gap was not quite there, it was better than other shows, but it felt awkward, especially during the kissing scenes in episode 12 when it is hinted they will have sex. Both look quite weird as Gap never opens his mouth and at one point he appears quite uncomfortable as he really tries not to open his mouth while still trying to look like he is kissing Mhing.
The only exception in the cast is definitely Offroad (playing Saint). He is making his debut as he was selected during the Laz Icon contest and became a Thai idol just recently. He even had a cameo in the series "Rak Diao/One Love" in episode 8 to promote the 5-member boy group and he is scheduled to appear in another BL series called "Game On". He still needs to improve his skills to convey some of the emotions the scene requires, but he was a pleasant surprise in the show. He really stole most of the scenes as he looked better (acting-wise) than Gap and Mhing when they were together.

3) The odd things:
Several details that were awkward or just odd and made not a lot of sense like... Micky kissing Q, Amy liking the basketball coach so much (which I'm sure would be a violation of several school rules), Mon's childish behavior with all the running away moments he had, So deciding to avoid Mon then deciding to pursue him despite going abroad, So-Mon awkwardly kissing, So's parents controlling his life and him having no courage to tell them no and even admitting at some point that he wants to go abroad (I mean, then why through all the emotional drama), some characters having misplaced motivations like Saint loves basketball because of Mon, Tim loves basketball because of Saint, Mon doing these weird bets and promises with Saint while So looks at both and fears Saint might ask Mon to be together if he wins the basketball game (Saint wins but only asks Mon to be friends again), Mon calling himself an asshole so many times in the series (low self-esteem anyone?!), So and Mon both thinking that they didn't deserve to be happy until they change their minds in the last episode, So's luxury apartment that he barely uses.

In the end, whether it was the poor screenplay and editing, the flawed acting or the disappointing directing combined with the super slow pace of some of the scenes, this show was a boat adrift without any clear direction.