I consider under 20 chapters short, but most of these are under 10-15! (Closer to 5-7 chapters).
https://www.mangago.zone/read-manga/shucchou_host_nyu_boy/
https://www.mangago.zone/read-manga/beauty_and_the_brawn/
https://www.mangago.zone/read-manga/harenai_sekai_de_kimi_dake_mieru/
https://www.mangago.zone/read-manga/samezoku_e_no_sasagemono/
https://www.mangago.zone/read-manga/gorani_jeon/
https://www.mangago.zone/read-manga/gomi_yashiki_no_kamakura_san/
https://www.mangago.zone/read-manga/hime_muko/
https://www.mangago.zone/read-manga/a_flower_that_blooms_in_shadow/
And one that is ongoing but is sooo good:
https://www.mangago.zone/read-manga/yoake_no_uta/
so anyone recommend any bl manga/hwa/hua just drop the link or title no other hints about the story I want to be totally clueless what's it about any genre will do and preferably it's just one shot or short story for quick read but you can still drop long one's