The name of the perfume is "Beautiful Woman", and it's Sooah's way of showing that she thinks Mirae is beautiful, so she is deserving of the perfume.
How does she know it was Sooah tho
We just assume that she knows because it's a manga haha. Also, Sooah is the only one with the weird complex around the word beautiful, and she's finally making improvements with therapy and whatnot.
Okay , thanks for the help.
Please explain what's the name of the perfume and how does it give away who gifted it to Mirae??