U-ri and Sun-young realise Na-young is Su-ji's sister and Yoon-ja's daughter. Therefore, Sun-young wants to reveal the truth behind the videos of Su-ji and Na-young. Meanwhile, Yoon-ja barges into Na-young's apartment as she has nowhere to go after being kicked out of Jang-soo's house. Then she finds out Na-young is secretly dating Hyun-sung, hiding the fact that she is Su-ji's sister.