Bad Buddy gained massive popularity and many fans. For many reasons I understand it because it has many things that other BL drama lack:
- Good cinemography
- Actors who can really act.
- Budget
- Realistic characters that are multidimensional

If I rated this show till episode 6 it would be 10 out of 10. But after finishing watching this show I feel it wasted its own potential. Storyline after episodes 5-6 went suddenly downhill. It was repetitive and messy like the screenwriter needed to make so many changes that he no longer knew how he should fill the remaining episodes. When I liked the show tackling some common misconceptions, there is a very clear difference in plot quality. People who watched Game of Thrones and saw horse meme know what I mean.
I know that the plot is based on the book, personally, I don't read or speak Thai but I can bet that main problem of this show (SCRENWRITTING) is related to changes they made to the plot of the novel which would also explain the subtle changes in characters personality in laters episodes.
Some people reading this will think - you ask for too much, it was already very good for BL! But I ask you to compare for yourself do you really think episodes 7-12 were as good as episodes 1-6? Having skilled actors for main roles they really wasted their great chemistry.