This story is very spicy, and I kinda love that the author is not doing the thing most manhwa do where nothing ever actually moves forward and people just talk about the same things over and over.
Dahye may continue to be stuck in "I wanna fuck Yeonhwa and make her suffer" mode, but it's an actual obsession at this point and it's already cost her her girlfriend.
Meanwhile, it's fascinating to see Yeonhwa be on the defensive - even though she's aware that she's making things too easy for Dahye, she doesn't seem like she knows what she should be doing. Either Yeonyoung really softened her up or she's really out of practice when it comes to being an evil manipulator.