Together With Me The Series - the story was messy but main leads have fantastic chemistry (apparently, second season is not very good)
Sotus S: The Series - second season of sotus. People loved it but I dont think it was as good as first season
Seven Days: Monday-Thursday + Seven Days: Friday-Sunday - based on really cute manga btw.
Addicted Heroin - the drama is unifinished and kinda problematic, but still good
Not really BL but still worth of mentioning:
(The Lover - has a gay side-couple. very funny drama but it's not worth it if you only watch it for BL
Reply 1997 - has a gay character who isnt that "flamboyant extra gay character" that is present in many thai dramas, there isnt really any development for him but the drama is still really great
The Boy Next Door - not really gay but they seem like a couple. its just a very funny little webdrama)
Btw: here are updated lists of korean, japanese, thai and chinese+taiwanse BL dramas,
