As much as I loved this story, I wouldn't classify it as a yaoi. The relationship between Sangwoo and Yoon Bum is far from romantic in my opinion and is very toxic/corrupted.
You may feel your favorite manga should be gathered together into distinct categories for your own reference and, now, you can do this with a LIST. After you've created your list or lists, you can proudly recommend them to other manga fans to showcase and share your taste in manga.
Love Is An Illusion