Hyera is definitely the super toxic one here bro. Her intentions are not purely to "help" Minji and Yuna's relationship. I'm not saying Yuna doesn't need to get her sh*t together because she does and needs to talk to Minji straight up about her feelings and making it know instead of wanting Minji to be the one to say it. Minji needs to set her priorities straight too. I get this is all new to her and she's confused, but if she and Yuna really are best friend they just need to talk it out and be honest with each other about theirs feeling. Hyera needs to stay away in orde for that to happen though because she is definitely putting a bigger wedge in the situation. Hyera is definitely not innocent here. I too suspect she either has a thing for Yuna or just gets a kick out of causing others trouble (think back to when she first rudely teased Yuna over hearing about Minji's dream).