Yuna, my hero. Hyera is such a bitch, harmful and was intent to be out right criminal. She knows Minji is a lightweight but I wouldn't be surprised if she would have roofied her to rape her either way.
Some people like Minji, and it's especially dangerous for young women, do not get that we're still living with wolves in sheep's clothings, that some people are wired different and only act in their own interest or will outright use others like toys for their own amusement.
At least, since she got pissed at her once, I hope that Yuna already has a better read on her, but she can't grasp yet just how much of a snake Hyera is. She's at the root of every problem. Even the Han Ji Hoon dating spiel!