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Edit :
It's been days I'm looking for this and just after posting this request I finally found it !!
It's Orchids of Endless Nights for thos who want to know ;)
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So, I was reading this yaoi last year, it was not a manga. I think it was chinese so propably manhua but it was in black and white.
It's about two brothers working (being trapped) in a brothel. The younger one just begins to take clients. The older one has a scar on the face and is picked by a noble because he seems manly.
I think there was something about flowers in the title but I'm not really sure.
Please help me find it ! :')