Thanks Halmoni!
Last chapter (chapter 27), No-Rae was acting out of character since the very beginning of her dinner meeting with Seol-A.
I don´t think so, she acted normally until Seol-A asked her to touch her.. And only after Seol-A made her touch her skin she realised what it was she was feeling.
There was no indication from Samba that No-Rae had realized anything at that point.
Small things, from realizing how pretty she is their first time meeting, the highlights:
In the subway
Ch 21 Her heart beating when she sees Seol-A, and later in the bus staring at her legs..
Public Transport is essential for developing Yuri Feelings!
It could be entirely possible that No-rae isn't comfortable with physical contact.
She is quite physical with Hye-kyung
I think No-rae is angry, but she's angry at herself. She never wanted to fall in love again, and that's why she's always been really careful about guarding her feelings; yet, she let Seol-a in. Chapter 28 sort of confirmed my speculations from the last chapter. No-rae has finally realized that she loves Seol-a, but now that she knows, she wants to distance herself so she won't have to go through the same pain again.
This, but also the realization she is gay I guess?