Hyewon knows she's the reason behind the split. That's why she showed a little bit of remorse last episode.
But by the time she sees Sooah in Jeju Island wandering around near Dowoo's studio......I have a feeling she'll change her mind.
She is always under an impression that Dowoo has a woman out there called Hyoeun's Mum and I don't think she understands a thing about fate or destiny. (Not that she'll try to find out too)
She will immediately jumps to conclusion that they have never broken off......please please please don't make a drama out of it. DON'T YOU DARE TO THREATEN THEM!