Wow, turns out that just having FL and ML hair to be dark is a lot to ask for, but I'm isekai/fantasy oriented, so maybe that's why ;) I searched through all my lists and the only ones with kinda fake dating and more or less dark hair I found are:
1. https://www.mangago.zone/read-manga/a_false_confession/
but here the artist left the company after season 2 due to health conditions and there is no new information of season 3 or the new artist
2. https://www.mangago.zone/read-manga/age_of_arrogance/
in progress, more of a political marriage than fake dating
then there are the ones, that have normal hair, but no fake dating:
3. https://www.mangago.zone/read-manga/the_evil_lady_s_hero/
completed with 110 chapters
4. https://www.mangago.zone/read-manga/koutei_heika_no_osewagakari/
I hope I helped (=・ω・=)
THANK YOU SO MUCH I LOVE YOUUU<333
I actually know age of arrogance too and you just reminded me to continue ittt, I stopped reading it for some time thank you againnn
I'M GOING TO READ THE OTHERSS YOU'RE AN ANGEL TYSM
Fake dating recommendations plsss
And slow burn if possibleee
The fl and ml hair NEEDS TO BE OF A DARK COLOUR
I'M TIRED OF SEEING WHITE, BLOND, AND PINK
Thankyouuu in advanceee
I already know about the selfish romance, and couple breaker, so other than thatt