I've read the raws:

It's about Hyera and Minjae flirting stage, Minjae telling to Hyera that she likes her while watching movie in cinema. I think, in Hyera thoughts, she found Minjae eyes beautiful. I'm not sure, but I think Hyera unconsciously like Minjae, even though in her mind she thinks about revenge to Yuna. If you observe Hyera's expression in texting Minjae (about what should they do either went to cafe or movie) you can see Hyera happily replies to Minjae's texts.

Then, when Minjae finally says, I like you to Hyera, Hyera remembers she want to ruin Yuna.

I think if Hyera would have resentment arc, it will be Red headed Min-jae realizing she's an idiot then finally get over Hyera. Then Hyera realizing that Min-Jae is also difficult to get again. Thus Hyera will chase her. -This would be nice I think.