BL novels for popular shows

So there are so many shows out that are based on bl novels or manhwa/manhua/Mangas and while I know some are kept pretty close I also have heard some are vastly different (like Not Me is supposdly nothing like the tv show) and it's got me super curious about the source material. so I'm curious if people can tell me which shows line up with what novels and i where to find them in english. I've heard love syndrome books are on wattpad and I found Scum System through my local library but I have no idea where else to look. Also please note as much as I would love to be able but all these I can't so if you think they can be found through a library please tell me. Thank you.

Also I've never really read any manga/manhwa/manhunt (though I did get the first 3 Alice in borderlands for Xmas lol) so inhave nonidea where tonfind them but I'd love to read my personal weatherman if someone could tell me where to find it?