In "Mask" Soo Ae exposed the relationship with Yeon Jung Hoon.
On the episode of SBS "Mask" broadcast on July 17th, Ji Sook (played by Soo Ae) asked Min Woo (played by Joo Ji Hoon) for a divorce in order to save him. Min Woo said, "If I get divorced, then my say gets smaller in the house. I may not even be able to get the company after all.
At this, Ji Sook was having a meal with her family and said, "I will divorce Min Woo." CEO Choi said, "What's the problem? Is there a problem with min Woo?" Ji Sook said, "It's not because of Min Woo but because I can't live with my brother-in-law. With that, she was pretty much admitting the fact that Ji Sook knew that Eun Ha and Suk Hoon had been in an affair. Because of this, the house went upside down. CEO Choi (played by Jun Guk Hwan) said, "How can you do this to my daughter? Get out." With that, Suk Hoon said, "It's only an old relationship. We're really nothing now.
Meanwhile, "Mask" is about a person that lives with a completely different life. She had killed a person and afterwards had taken her identity.