I'll have to think about this a bit more and I might split it at the end of 2021.
UPDATE: List was created early 2020, so I was pondering on whether to split this list in two, but decided not to, since quite a few series have a split air time 2020/2021. (China-Mainland China + Hong Kong, Taiwan, Japan, South Korea, Thailand.) Currently airing, upcoming and finished BL/Gay themed dramas and movies of 20.