Bad Buddy has taught us two things. First is that a great chemistry between the actors can bring out the emotions of the viewers no matter how good the story is and second is that the standard for BL dramas is tragically low.
And by neither of those points do I mean to say that the story of this drama was awfully constructed, but am simply pointing out how the plot itself isn't anything note-worthy compared to the real strong points of the series.

STORY:
With the exclusion of the romance we aren't left with much. The main point of the story is that the guys were forced to become rivals due to the pressure from their parents, but even if the reason for the hatred between the two families is explained and they eventually let their sons interact with each other, we've never really found out why the two families decided to live next to each other if they've been in a conflict since high school.
The story is introduced by a fight breaking out, but we still don't know why Pat and Pran ended up getting involved with the "gangs" in the first place or why their faculties had such a deep rivalry to the point when they were willing to beat each other up.
Everyone seemed to start secluding Pat and Pran after having found out about their relationship, but when Pat went to give Pran the USB and was asked to shout out his love for Pran, nobody had expressed a disagreement with it.
There was a build up to Wai being a fake best friend who was guilt tripping Pran and using him when it was convenient, but then he did a complete 360 and suddenly came around to help Pat and start being friends with them after only one favour.

I think a lot of these points are related to how the story of the novel was changed in order to introduce a happier ending, but this had unfortunately fragmented the plot into serious and dark parts followed by easy solutions and light-hearted moments with happy conclusions which made me feel like there wasn't a very consistent flow of the overall plot.

HOWEVER, the romance part and the way the drama revealed its plotwists was the more significant and majority part of the story.
We were introduced to Pran and Pat being faculty rivals who had nothing in common, but the impression was progressively broken as the two began revealing their closeness, common history and their long-term pinning for each other. The reveals had the power to make people invested in their story and want to know more about the characters' true feelings and further developments. The build-up was done at just the right pacing, we watched Pran realise his feelings while Pat was out there subtly flirting for 5 episodes straight. The first kiss was completely unexpected, yet hadn't brought a conclusion to their story, instead opening space for even more difficulties and the flirting game which ended with Pat finally indirectly confessing his feelings brought quite an exciting development with a satisfying end. And even after they'd started dating, their relationship dynamic was fun and sweet enough to keep people interested no matter what the non-romance part of the plot was focusing on. Episode 11 felt like a promise of them staying together no matter what the rest of the world thinks or how conflicting their opinions were and episode 12 had absolutely delivered and diligently stuck to this mindset.
Each of the episodes ended in a way which made the viewers highly anticipate and theorise about the next progress of the story no matter at what point their relationship was.

Lastly, let me talk about the low standards for BL dramas now.
I have this opinion partially because of the non-relationship part of the story and mainly because of all the harmful stereotypes Bad Buddy has managed to avoid.
One of the two reasons this drama is so highly praised is the healthy relationship development between both of the main couples. The dialogues have not only omitted any uncomfortable BL tropes, but also outright mocked them. We had the whole "it'd be ridiculous if I said I was straight and you were my only exception" conversation, no mentions of wives or girlfriends in regards to Pran and Pat's relationship and even when Pat was roleplaying as Pran's girlfriend in episode 3, he'd purposely exaggerated his behaviour to seem as a guy who was jokingly acting like a girl instead of portraying himself. The dynamic between Pat and Pran never felt one-sided, they both respected each other as partners, neither of them was overpowering over the other and they talked out their conflict with each of them being allowed to equally express his opinions.
The relationship between the girls was portrayed so refreshingly too, they didn't have any long-lasting conflicts, it was just pure love that started out of a coincidental meeting and their dynamic was fit to be that of a side couple. There is such an underrepresentation of GLs that it made me overjoyed to see this kind of relationship in a popular drama of its neighbouring "genre".
Neither of the couples were sexualised, there was no bottom/top talk, none of the kisses and touches happened without consent or while under the influence of alcohol.
And a really thoughtful detail was shown at the end when Wai with Korn openly "flirted" as a part of their bromance despite both being in a stable relationship. It proved how people can be great friends while still flirting and jokingly acting as a couple, as long as they have that kind of trust with their partner.

And that's why I think it's a huge shame such a bare minimum has to be celebrated when this should be the norm for all BL/GL dramas. Imagine how good a drama of these "genres" could be if it had more than a basic plot while still focusing on this the relationship dynamic in this way and to this extent. Obviously, we're still at a point when we need to up-bring the healthy gay relationships in order to increase the quality of these "genres" and make them more realistic instead of settling for anything we're offered. So hopefully Bad Buddy can be the motivation for directors and writers to do better and not ignore the voices for the actual LGBTQ+ viewers.

ACTING:
This brings me to the second reason of why this drama was such a success.

Ohm and Nanon's amazing chemistry has seeped into the characters they were playing and further served to improve the relationship parts of the story. The bus stop designing scene from episode 3 probably would've been quite awkward if actors who weren't as close had to portray it. All the expressions of affection felt very natural since they'd put effort into practising even those kinds of things off camera. They'd always managed to express the right amount of affection and adoration during the scenes and dialogues.

All the main side actors were great, but the OhmNanon chemistry is definitely the main highlight of it all.

MUSIC:
Pran's two songs were well composed, catchy and memorable and their incorporation into the plot also made them stand out. They complimented the atmosphere and despite having quite cheesy lyrics, it worked well with the pair.

What I personally minded was the rest of the soundtrack. Some songs felt too overpowering to the point when they seemed to be interfering with the scene instead of setting the atmosphere. There were scenes with rapid changes of mood where the strong changes between background music wasn't very pleasant and felt too dramatic and unnecessary to me.

OVERALL:
Despite its minor flaws, Bad Buddy absolutely has to be one of the best BLs to have ever been produced in East Asia. This drama has finally reached the standards which should be considered the norm and aimed to be achieved by other BL dramas in the future.

I'm just really hoping the fans of this "genre" can also improve their mindsets together with the dramas and learn to do their part by ceasing to ship the actors, making a clear divide between the character and its actor and stop obsessing over the top/bottom debate (it's just as harmful as thinking gay relationship need to have the traditional labels of the husband and wife roles). I believe that if these kinds of opinions stop being so normalised in the BL community, we have a higher chance of seeing the quality of future dramas improve.