"Gu Family Book" Bae Suzy tells Lee Seung Gi the secret she has been hiding about their past.

May 7, the 10th episode of the MBC drama "Gu Family Book" featured Dam Yeo Wool (Bae Suzy) revealing the secret she has been hiding from Choi Kang Chi (Lee Seung Gi) after they get locked inside of a secret safe.

Also, while Dam Yeo Wool and Choi Kang Chi try to hide themselves, they get tangled up in each other's bodies. During the process, Choi Kang Chi discovers that Dam Yeo Wool is actually a woman.

Dam Yeo Wool does not appear herself so Choi Kang Chi asks how she is feeling. Choi Kang Chi sees the deep scar on her arm. Even though he asks her where she got the scar from, she does not answer. Dam Yeo Wool had gotten the scar from Choi Kang Chi when he previously turned into a beast.

Dam Yeo Wool begins to lose consciousness. Choi Kang Chi says, "You don't look very well at all" and Dam Yeo Wool replies, "It's Yeo Wool. My name is Dam Yeo Wool, you stupid." She then loses consciousness completely.

After learning her name, Choi Kang Chi remembers their past involving a wild dog in the mountains.