Seongji's one-sided battle to break down Sumin's walls continues, and her hard work is finally paying off! Although it takes some poking and prodding, Sumin is being clearer about her feelings and intentions in her own roundabout way. But just as Seongji begins to see the results of her efforts, Seju makes her presence known again! Consumed by her desire to keep Sumin in her life, Seju takes a stab at making Sumin jealous. Can Seongji and Sumin's budding relationship withstand her provocation, or will Sumin once again turn towards the ex she's unable to forget?