https://www.mangago.zone/read-manga/you_who_wants_to_love/ manga
https://www.mangago.zone/read-manga/highest_order/
https://www.mangago.zone/read-manga/never_understand/
https://www.mangago.zone/read-manga/love_is_an_illusion/
https://www.mangago.zone/read-manga/koubutsu_wa_ichiban_saigo_ni_hara_no_naka/ manga (posted separately)
Stories with 3 couples
https://www.mangago.zone/read-manga/no_better_than_strangers/
https://www.mangago.zone/read-manga/ookami_kun_wa_kowakunai/ manga (posted separately)
https://www.mangago.zone/read-manga/inukei_no_kareshi/ (1 side couple)
https://www.mangago.zone/read-manga/highest_order/ (2 side couples or was it 3?)
https://www.mangago.zone/read-manga/mr_100_perfect/ (1)
https://www.mangago.zone/read-manga/long_time_red_mall/ (1)
https://www.mangago.zone/read-manga/cherry_magic_thirty_years_of_virginity_can_make_you_a_wizard/ (1)
https://www.mangago.zone/read-manga/the_man_who_can_t_taste/
BL manhwa with lots of side couples