"Gu Family Book" Lee Yoo Bi begins to plan her revenge against Lee Sung Jae after spending the night with him.

May 14, the 12th episode of the MBC drama "Gu Family Book" featured Park Chung Jo (Lee Yoo Bi) spending the night with Jo Kwan Woong (Lee Sung Jae) in order to save her older brother, Park Tae Seo (Yoo Yeon Suk).

Jo Kwan Woong forces Park Chung Jo to spend the night with him by threatening her brother's life. After spending the night together, Jo Kwan Woong calls Park Tae Seo into the room. Park Tae Seo begins to panic after realizing what had happened. Jo Kwan Woong tells him, "Your little sister saved your life."

Park Chung Jo walks back to the place she was sold off to by herself. When Wol Sun (Son Ga Young) laughs at Park Chung Jo's fate, Park Chung Jo says, "Didn't somebody say that my fate may bloom again like a flower in spring... then what happens to the fate of the escort ladies here?"

Park Chung Jo tells Chun Soo Ryun (Jung Hye Young), "I was told that my dream could come true. Can I really believe that this is really not the end? It is my hope. I want to become hopeful and live my life again" and begins to cry.