The younger woman is a woman not a " girl " she's 24yrs old and Jinjoo is 40yrs old so if Jinjoo can leave her husband first and go try again to mend things with her parents then she is free to be with Doyeon....but she has to make all those choices for her own sake and life...taking back her life should be her main goal...also she's only 40yrs old,i know many of you here are teens or in their twenties but 40yrs old isn't old at all,the author just drew Jinjoo that way to make her seem old and measurable to fit the story.
Do you think i don't want them together???? It's not because of the age thing, it's because they're all f*cked up ヽ(`Д´)ﾉ
Jin joo should leave her husband but she shouldn't be with the younger girl either. All of them should go to therapy, then have a normal life