Bl

How about Perfect Buddy? It's an office setting with coworker x coworker. It's technically and enemy to lover manhwa since the MCs are could technically be rivals (Tho the uke is the one mostly holding those feelings as he dislikes the seme lmao)

Though I apologize if you were specifically looking for a manga ╥﹏╥ since I did recommended you a manhwa

FLUFF! manga/manhwa. mostly office workers

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

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

https://www.mangago.zone/read-manga/fake_fact_lips/ (office workers & enemy to lovers)

https://www.mangago.zone/read-manga/old_fashioned_cupcake/ (kinda realistic)

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

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

Fake fact lips

Here coworkers and enemies to lovers
https://www.mangago.zone/read-manga/no_love_zone/

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

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

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

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

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

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

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

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

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

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