reccomend underrated/unknown bls!

RAINBOW CITY
RAINBOW CITYYYYYY
CAN'T HOLD BACK READINNG ITTTT
RAINBOW CITYYY
RAINBOW CITYYYYY
TURN AROUND AND READ IT ALLLL
I DONT CAREEEE BUT THE IDIOTS SAYYYY
IM GONNA RECCOMEND RAINBOW CITYYYY
THE ZOMBIE APOCOLYPSE NEVER BOTHERED ME ANYWAY

into the thrill
little mushroom
breaking through the clouds 2: swallow the sea
my four masters
https://www.mangago.zone/home/mangalist/2854425/
redeem: only one forever
hwang young's misery
the boundary of fragrance
night fragments
stakeout
forced strategy 100%
the dawn split the night
big apple
heart racer

Not really sure if this is unknown or unpopular but really anything by this author is a true gem and all their stuff is completed. I've read nearly all the stuff from them on this site and it's all been top notch

https://www.mangago.zone/read-manga/bakeneko_katatte_sourou/

If you like novels:
https://www.foxaholic.com/novel/sha-qing/
https://lotusscribe.com/novel/the-plough/
https://dustbunnytranslations.wordpress.com/wushuang-4/ (This also has a manhua but its in pdf)
https://www.foxaholic.com/novel/transmigrating-into-the-heartthrobs-cannon-fodder-childhood-friend/
https://rainbow-reads.com/please-follow-the-rules-of-the-game/
https://mentoltrans.wordpress.com/the-hunters-gonna-lay-low/ (This has a manhwa, but its ongoing at 11 (?) chapters, and its also not that unknown so you might have seen it on here)

If you like manhwa/huas (i dont read many cus i prefer novels so they're probably quite popular, but here i some that i think are quite underrated ):
Kiss the abyss (not sure if this is unknown )
https://www.mangago.zone/read-manga/night_of_the_unmarked/
https://www.mangago.zone/read-manga/a_trace_of_the_wonder/
https://www.mangago.zone/read-manga/the_snake_demon_wants_to_flee/ (tl is ongoing but raws have more chapters)
https://www.mangago.zone/read-manga/my_house_has_become_a_filming_location/
Rainbow city. (Both novel and manhwa but i cant find a good tl of the novel)
https://www.mangago.zone/read-manga/rejoice_in_your_enemies/
https://www.mangago.zone/read-manga/don_t_mess_with_the_puppy/ (theres a novel for this too)
https://www.mangago.zone/read-manga/paljae/
https://www.mangago.zone/read-manga/tiger_and_tiger_gourd/
https://www.mangago.zone/read-manga/tread_lightly_on_thawing_ice/
https://www.mangago.zone/read-manga/stakeout/
https://www.mangago.zone/read-manga/exclusive_no_love_zone/ (not sure if this is unknown)
https://www.mangago.zone/read-manga/salad_days_tang_liuzang/ bro pleasepelaseasplewplapelapelwapwael but im not sure if its unknown
Seek For Three Lifetimes manga - Mangago (i think theres a novel for this but i cant find a tl)
Find Cinderella! (Yaoi) manga - Mangago
Mr. Snail manga - Mangago (not sure if this is unknown but bro bplease this is too good to not recommend)
God's ID Card manga - Mangago
AoAo Waiting to Be Eaten (Caught!!) manga - Mangago

https://www.mangago.zone/home/mangalist/2838093/
Here list of Underrated Good BLs...

Sangyang:the Wanderer

Personal fav I don't see anyone talk about ^^
https://www.mangago.zone/read-manga/kagakubu_no_megane/

Also a personal fav. Weird premise, but it's good, promise! It's a spinoff but you can read it on its own.
https://www.mangago.zone/read-manga/sensei_mou_dame_desu/

This one doesn't have a lot of actual romance, but I remember it being very cute.
https://www.mangago.zone/read-manga/dasadanan/

This one is also quite sweet.
https://www.mangago.zone/read-manga/18_44/

This one's a bit sad. Also has more ratings compared to the rest so you may of heard of this one.
https://www.mangago.zone/read-manga/wind_blowing_tonight/