https://www.mangago.zone/read-manga/the_new_employee/
office setting, age gap, overall very healthy, the relationship progresses very naturally.
https://www.mangago.zone/read-manga/kill_the_lights/
the mc (a mercenary) reincarnates into a problematic(?) actor's body after dying
https://www.mangago.zone/read-manga/again_1/
mc dies and goes back a few years into the past with the resolution to change who he was before
https://www.mangago.zone/read-manga/hitori_h_online/
mc watches a camboy on stream and realizes it's actually his coworker
https://www.mangago.zone/read-manga/spinach_bouquet/
highschool setting, pretty much slice of life, the last 20 or something chapters are somewhat of a thrill ride (it's a very good manhwa regardless)
https://www.mangago.zone/read-manga/nekama_punch/
the mc accidentally makes his previous sworn-enemy (or something like that) think that he's a girl in a game, owns it, and decides to scam him in order to get revenge
https://www.mangago.zone/read-manga/the_art_of_taming_a_tiger/
mc trips over his new neighbor's boxes and gets a bracelet stuck on his wrist, so he begins to attract ghosts. his neighbor decides to help him eliminate them.
https://www.mangago.zone/read-manga/the_third_ending/
every time mc dreams about his highschool classmate something bad happens, so after meeting him by chance on the bakery by his workplace, he decides to get close to him so he can apologize (i believe it was like that, but it might differ slightly)
https://www.mangago.zone/read-manga/i_became_the_lousy_side_top_official/
the name sounds silly but it's one of my faves, mc gets transmigrated into one of the villains (?) in a bl novel and decides to fix his relationship with the novel's protagonist with food, so he doesn't meet the villain's fate
https://www.mangago.zone/read-manga/toumei_na_ai_no_utsuwa/
mc is prone to misfortune. one day he finds a strange man in the middle of the street who asks to feed on his misfortune.
Any genre, pls drop me some COMPLETED BL manhwas/mangas.