All of these are office romance (≧∀≦)
https://www.mangago.zone/read-manga/what_s_wrong_with_secretary_kim/
https://www.mangago.zone/read-manga/let_s_go_to_work_tomorrow/
https://www.mangago.zone/read-manga/1_24_romance/
https://www.mangago.zone/read-manga/a_bittersweet_couple/
https://www.mangago.zone/read-manga/faking_it_in_style/
https://www.mangago.zone/read-manga/surely_a_happy_ending/
https://www.mangago.zone/read-manga/a_child_who_looks_like_me/
https://www.mangago.zone/read-manga/the_lady_and_her_butler/
https://www.mangago.zone/read-manga/the_problem_of_my_love_affair/
https://www.mangago.zone/read-manga/i_have_no_intention_of_dating/
https://www.mangago.zone/read-manga/lee_seop_s_romance/
https://www.mangago.zone/read-manga/lovely_again_today/
https://www.mangago.zone/read-manga/masked_woman/
https://www.mangago.zone/read-manga/please_take_care_of_me_in_this_life_as_well/
https://www.mangago.zone/read-manga/a_love_contract_with_the_devil/
https://www.mangago.zone/read-manga/lion_heart_choi_soo_hyun/
https://www.mangago.zone/read-manga/for_the_third_time/
https://www.mangago.zone/read-manga/the_team_leader_is_tired_of_being_a_newlywed/
Any modern day straight romances similar to business proposal or positively yours