In "Mask" the secret behind Joo Ji Hoon's wife and Yeon Jeong Hoon was revealed. It turned out that in the past, Soo Ae, the wife of Joo Ji Hoon and his brother-in-law Yeon Jeong Hoon were lovers in the past.
In the episode of SBS Wednesday/Thursday drama "Mask" (script Choi Ho Chul, Director Boo Sung Chul) broadcast on June 18th, Min Woo (played by Joo Ji Hoon) understood the relationship between Suh Eun Ah (played by Soo Ah) and his brother in law Suk Hoon (played by Yeon Jeong Hoon).
Min Woo had been looking into the pen that his sister had given. He learned that that was a gift that his wife had actually given to his brother-in-law Suk Hoon. This made the puzzle pieces come together. Min Woo saw that the picture that was hanging in Suk Hoon's office was related to Suh Eun Ah. Through that, he could tell that the two were related to each other in a past relationship.
He thus went to Ji Sook and said, "I need to know who you had loved before? I need to know that my thoughts were wrong in the past." Suk Hoon wanted to really check whether this was the person that she had loved.
