BL manhwa refers to Boys' Love comics or graphic novels that come from South Korea and feature romantic or intimate relationships between male characters.
Since I don't know much about 'profundis manhwa novel', it's hard to give an exact match. However, if it has a dark or mysterious theme, 'Bastard' could be something to look into. It has a really gripping and somewhat disturbing plot that keeps readers on their toes. There are also manhwas like 'UnOrdinary' which deals with power dynamics and has a large following.
Well, a rut bl manhwa usually features male-male romantic relationships and explores various themes related to love and emotions. It's a popular genre in the world of manga.