In "Mask" Yoo In Young told Yeon Jung Hoon that she knew the relationship between Yeon Jung Hoon and Soo Ae.
On the 13th episode of SBS Wednesday/Thursday drama "Mask" broadcast on July 8th, Choi Min Young (played by Yoo In Young) confessed that she had not been pregnant but that it was an imaginary pregnancy.
On this day, Choi Mi Yeon was at an ultimate loss. She had been imagining that she was in a pregnancy and to her family members that had been having a tough time, she was fussy.
Choi Mi Yeon went into the room and said to Min Suk Hoon (played by Yeon Jung Hoon), "Can you give me your cell phone? There are pictures there. If you open it, then you'll see" as he asked to look at the cellphone. In Choi Mi Yeon's cellphone was a picture that Min Suk Hoon and Suk Eun Ha (played by Soo Ae) had been friendly and cuddly.
Min Suk Hoon was startled but said to Choi Mi Yeon, "Maybe she doesn't remember the relationship with Suk Hoon. I thought she was pretending not to know. Then again, that's what Suk Hoon said. To believe his lies. That to win , you have to believe in the game. I'm not going to believe Suk Hoon's lies now. The person who believes will then lose."