Like for real? She actually pretended to have period? Was it in the novel?
https://mangabuddy.com/manga-list/137636 (BL manhwas and Mangas)
https://mangabuddy.com/manga-list/138031 (Deep manhwas and manga, some are BL and other have no romance)
https://mangabuddy.com/manga-list/138031 (Deep manhwas and manga, some are BL and other have no romance)