For some reason I can't find it... so here's the summary:
Uke just had breakup with gf and seme consoles him and suggest to try dating him
It's a webtoon.. Uke is straight, has pink hair wears beanie hat, while seme is gay, black hair and has been in love with uke for a long time.
https://www.mangago.me/read-manga/steady_love/ ? but the mc has brown hair but it seems really similar
Where the uke is unsuccessful with love until seme gives them their best lovelife
I gotcha youuu: https://www.mangago.me/read-manga/koi_ga_ochitara/ (Green flag seme <3)
Sequel: https://www.mangago.me/read-manga/koi_ga_michitara/ (STILL A GREEN FLAG)
Story is fluffy tho