*breathes heavily* it took forever- but is it any of these???
https://www.mangago.zone/read-manga/you_and_i_can_t_do_this/
https://www.mangago.zone/read-manga/ameiro_paradox/
honestly I spent nearly 2 hours looking for it and this was the closet thing I found to the plot you described, if you have character descriptions that be a ton of help
https://myreadingmanga.info/ossans-love-2018-engsub/
https://www.ebay.com/itm/116608549785
https://www.anime-planet.com/manga/ossans-love
doing some research the manga is a retelling of the 2018 live-action TV drama of Ossan’s Love, not a direct sequel. It adapts the same core love triangle (Haruta × Maki × Kurosawa) with a few differences
The official Ossan’s Love manga and drama focus on:
-Romantic comedy between a love triangle
-Office romance
-Emotional growth and self-acceptance
But your memory of it goes:
-A promiscuous coworker
-Manipulating the MC, then
-Falling for a second ML who becomes CEO, and
-Dyeing his hair, transforming to win his affection
…it likely comes from a doujinshi that reinterprets Ossan’s Love characters because I believe that the manga was never uploaded to this site or was deleted, because I have searched far and wide but there no free online versions of this manga
and seeing how you've been looking for this Manga for like more than a year~!!
--------------------------------------OSSAN'S LOVE MASTERLIST ------------------------------------
Ossan's Love (2016) - the original short 1 episode special that started the idea
* Ossan's Love (2018) - the short special was remade into a full series -- START HERE
* Ossan's Love: LOVE or DEAD (2019) - the movie continuation, a sequel to the first season
Ossan's Love: In the Sky (2019) - an alternate universe series, with some of the same characters in a different story setting. Doesn't have any connection to the main storyline so is totally standalone.
Ossan's Love In the Sky Special Spinoff (2019) - 2 episode side story
--------------------------------------------------------------------------------------------------------------
(I'm guessing you were right about here since it was 2024 when you started looking, and SOOO based off of that I think you probably- dunno if you're a fan of the show or not. may have read a dj during the height of popularity from this yaoi show)
* Ossan's Love Returns (2024) -- the continuation from the movie
Ossan's Love Returns Tver Spinoff (2024) - side story
Ossan's Love Returns TELASA Spinoff (2024) - 2 episode side story
There is also a Hong Kong remake also called "Ossan's Love" (HK, 2021).
I believe this is it?
https://myreadingmanga.info/un-coppu-shiranai-kaiju-ossans-love-dj-jp/
if I'm wrong please tell me, and give me more details
here are also all the names of Ossan's Love doujinshis, just in case it was actually a doujinshi- you did read
Tenkuun no Naka no Hito
Ichiokusanzenmanbun no Ni
Haru no Arashi
AlbumA Sairoku 2
Colorful World (Anthology)
Tomorrow Engage
Suteki na Koibito
Stargazer
You did a lot of research thank u but I feel bad to say that it's not this one it was a whole manga not a doujinshi with two stories one with the main couple MC was white haired and ML with black hair, second ML also had a little long white hair as well coworker had white hair as well but later he dies it to black 2nd ML knows MC for a long time maybe a childhood friend or a classmate he's rich maybe a conglomerate or a mafia and ML persues MC from day one but MC doesn’t react he starts liking him but refuse to acknowledge it thanks to the promiscus coworker 2nd ML also confess to MC but later backs away when MC and ML gets together and becomes their boss at work and then MC starts pursuing him dye his hair and asking him to have a office dinner but he refuses then gives in that's all I remember (▰˘◡˘▰)
Actually I forgot its name it was a yaoi Japanese manga *it was a n office romance, I read it here so the story goes as (the MC was having a bit of difficult time accepting MLs feeling and there's MCs office coworker who was bit promiscuous manipulating him against the ML that he should not accept or love him as LOVE is not worth it , but then he actually falls for the 2nd ML who was MCs friend (kinda rich I guess) who himself was rejected by MC. It was kind of spin off/side story i don't remember very well starring coworker×2nd ML coworker gets character development and start to chase 2nd ML to get on his good side[2nd ML kind of becomes the CEO of their company] and he really dislike the coworker who is now pursuing him but coworker actually really genuinely likes him and want to know him and also changes his appearance *dye at that time it was ongoing maybe it have been completed by now his hair if anyone knows please I'll appreciate it, if someone needs more details I can give it about the storyline and setting but I just want to know the name so bad