What webtoon is this?

So my friend kinda explained what it was about but said it was a while back so this is the only info I got to find this webtoon. It’s an Asian historical rebellion world where the peasant female lead is looking for her missing brother. She meets the first male lead at a brothel to try and get info on her brother. The second male lead has red hair and smokes a lot and is big in the rebellion. The red hair guys turns out to be childhood friend of female lead and kidnaps or takes her away and paints on her naked back. It seems really detailed and easy but I’ve been coming blank anything you guys know that’s similar? Thank you