Dramaworld

Both are set within fictional worlds in which the FL is aware it's a story and the plot is going array. Both FLs fall in love with someone they don't belong with (ML vs. the story's romance-less villain). Both dramas play with common tropes and are short length.

Both are parodies about the world of Asian drama / manga in which a person in this world experience it as an outsider. While Zettai BL ni Naru Sekai vs Zettai BL ni Naritakunai Otoko deals with BL Manga, Drama world deals with Korean Drama. They use a lot of clichés a fan will recognize instantly