Well well... what a pleasant suprise!
Thai BLs can be different? What a discovery! You mean to tell me not all Thai BLs are set in schools/universities and not all Thai BL characters are engineering or medical students? Who knew!

There are several things that make Manner of Death a "must watch":
First, Max and Tul. Enough said...
No, really, the chemistry between them is off the chart, so much so that now that Max is dating Mook, Max's fans started getting angry on social media because of that and Tul showed some support for both in some interviews you can find on Youtube. They have worked together on several series and it shows, they are confident with each other, willing to commit to a sexy scene (unlike Plan and Mean who look like they are suffering instead of kissing, especially Plan), and feed off of each other to improve the scene. Their acting is not flawless but they do complement each other and are a strong couple plus their sexy scenes do not look forced at all.

Second, great support characters.
Great as inspector M, Foei as prosecutor Pued, Mint as Rungtiwa, MD as Oat, Bhu as That, Meiko as Jenjira, Putter as Sorawit, even A as Por, Wantanee as Nam, ChaiTouch as Gun and the other senior actors playing the head of the police department, the judge, and the nurses at the hospital, play a vital role in making this a successful series. They help Max and Tul by building convincing characters that are not just there just to be there. And everyone is connected in the end and each character finds a resolution. This is different from other BL series where you see a character for one or two episodes only to never be seen again without any clear idea of what happened to that character. Or you see a character that is only there for comedic relief or to scream or "ship" the main couple but do not provide anything more than that. Manner of Death was able to integrate the cast more effectively and everyone serves a role and has a purpose in this story.

Third, good writing.
Often times I get annoyed with the poor writing we see in plenty of BLs, with the characters not communicating properly leading to many unnecessary arguments/fights, or plenty of tears and confusion. Or sometimes we get super crazy or completely impossible stories that make absolutely no sense at all but if you take that weird story out, then you have no BL. Here, you have a good story of human trafficking, prostitution, murder, corruption that becomes the thread that Max and Tul's characters have to follow to solve this case. In the process, good writing puts some twists in the story and makes the whole cast shine. I can argue that sometimes Great's character (Inspector M) was better than Max or Tul's characters, but that is what good writing and a credible storyline does to a series. Plus, the author and the director correctly decided when it was time for Max and Tul to have a sexy moment and it was ok given the situation they were going through in the series. The scenes look natural and not like Y-Destiny or WhyRU when you had actors just getting shirtless for no apparent reason.

Of course, the series had some not so good moments like some of the actors, especially A, Mint and the head of the police department, exaggerating their lines or their expressions which made look a bit crazy or fake. Tul's character was a bit naïve sometimes and Max's character was a bit too cocky as well in some situations. Plus, I would have like to see a bit more development with Bhu-Putter and even the hint of Great-MD we got in the final episode as potential side couples but with this being a different BL I don't feel too bad about this. Some of the punishments the bad guys got were a bit disappointing like Rungtiwa being killed by Por felt like an easy solution for her instead of having the real killer of her own sister suffer a bit more in jail.

But, in the end, Manner of Death brought 14 quite entertaining episodes especially because it was not the typical Thai/GMMTV BL (Tonhon Chonlatee, Fish upon the sky, 2gether the series, etc.) or the typical low-budget Thai BLs we've seen lately (Love at 7-11, Love Poison, Hometown's Embrace, I am Your King SS2, etc.), and just because of that, we should appreciate it.