In all honesty the main reason I am still reading this title is the art is so good and the main females are beautiful.
I usually pull for the childhood friend but not really in this case. A couple of things I am looking out for is how she reacts when the nurse comes to collect on their deal and her reaction to the first time another guy makes a serious pass at her. Well she be jealous/angry of Pyo with the nurse? Will she fall into bed with another guy?
I do believe that she genuinely wants Pyo to be at her side, but in what capacity? As a real lover or as a tool? Not even sure she really knows a this point.
I am hoping that she eventually realized she loves him but messed it up big time. The only good ending for MC is for the prostitute to return to be with him but I don't see that happening either.