The manhwa had a princess or high ranking noblewoman who saw a singer getting kicked out on the street by this guy who owned the place where she sang. The mc helps the singer (I remember the singer had dark skin for a manhwa and I want to say she was supposed to be Romani) and the singer promises her a favor. I remember the mc was in disguise and with someone. I read this a while back and I can't remember what series it was from. I want to say it was from When the Villainess is in Love, Two Faced Princess, or A Royal Princess with Black Hair but I really can't remember and it's bugging me.

Uh was the MC a girl with green hair?

I think it might be:
Revolutionary Princess Eve

But then again I'm not sure. There's always a singer/actress in need of help with some of these iseki stories

I could have sworn she was blonde. (The isekai tropes are a curse sometimes.) Thanks for the suggestion though.