Hello just in case youre unaware. You can go to this page: http://www.mangago.me/genre/all/
And check yaoi/shounen ai, webtoon and select Completed. That way it will show you ALL completed bl webtoons. You can also choose to sort it according to the popularity/number of views, rating, create date, etc.
Yeah, I am aware you can do this but sometimes mangago have some series that are listed ongoing when in fact it's completed
On manhwas marked as ongoing even if they are already completed, you can click on the flag on the left side of the screen and report it under "the manga info is wrong" that the manhwa is already completed. That way you will be able to help the mods/admin correct the information of the manhwa. Thank you :>
Link: http://www.mangago.me/home/mangalist/288774/
I compiled a list of completed BL webtoons for those who are impatient like me ╮(￣▽￣)╭
I haven't read all of them and I'm not done compiling everything yet. Of course please reply series that aren't on the list to help fellow readers too!!!