Amongst two such driven people with little to no moral boundaries Hong-joo doesn't really stand a chance. She finally cracks, unable to stand the pressure of her new position, her cheating husband, the attacks from Ji-seon and Se-young, and the weight of her fury and pain driven revenge. We finally see the Hong-joo from the beginning: the innocent, sweet, mild-mannered woman who could not fathom such a thing as revenge. It is now she sees what we see, that revenge is harder on her that it is on anyone else. She turns to Seok-hoon, the most honest person in this entire mess, which makes this twisty pretzel of a story even twistier.