Is it jealousy? What is her story…..

We don’t have a clear backstory for haesol yet but I have a feeling that she choose yeonwoo for a reason and not anyone else. She clearly saw yeonwoo codependency with junhyuk and probably wants that for herself with him which is also why she hates junhyuk because he’s someone special for yeonwooo and irreplaceable. Her feelings for yeonwoo are clearly not romantic but are possessive. I wonder whats everyone’s else's take on haesol? Or theory’s? (⌒▽⌒)