"Gu Family Book" Lee Yoo Bi may be forced to spend a night with Lee Sung Jae, the man who tore apart her family.

May 7, the 10th episode of the MBC drama "Gu Family Book" featured Jo Kwan Woong (Lee Sung Jae) demanding that he will be the first one to sleep with Park Chung Jo (Lee Yoo Bi) right as she gets sold to become a prostitute.

Jo Kwan Woong makes Park Chung Jo sit in front of him while he enjoys alcohol and delicacies. Even though Park Chung Jo is shaking with fury as she stares into the eyes of the man who tore her family apart, Jo Kwan Woong finds her cute.

Right then however, Chun Soo Ryun (Jung Hye Young) enters the room and says, "She hasn't even been properly trained so I came in to get her." Jo Kwan Woong replies, "Can't I even watch her? I won't even request to spend the night together. Don't you think you will have to give me something in return though?"

Chun Soo Ryun calls out Park Chung Jo and tells her, "Just stick it out. The only way you'll get a chance is if you stay alive. The chance to pay back all the embarrassment and anger. Just think of that day and stick it out."

With the though in her mind, Park Chung Jo remains in her place even when Jo Kwan Woong tries to kiss her.

At the end of the episode however, Jo Kwan Woong becomes extremely furious after learning that Choi Kang Chi (Lee Seung Gi) had stolen money. As a result, Jo Kwan Woong demands Chu Soo Ryun that he will have to sleep with Park Chung Jo. When Park Tae Seo (Yoo Yeon Suk) finds out, he goes to Choi Kang Chi and gets down on his knees to beg for his little sister's life.