As 'Secret Love Affair' Yoo Ah In and Kim Hee Ae started their dangerous love affair after living together, Yoo Ah In asked Kim Hee Ae, "How do you not remember the kiss?"

On the fifth episode of the cable channel JTBC's "Secret Love Affair" which aired on March 31, 2014, Lee Sun Jae, played by Yoo Ah In, and Oh Hye Won, played by Kim Hee Ae, started living together at Oh Hye Won's house. Oh Hye Won's husband Kim Joon Hyung bailed Lee Sun Jae out of the jail and took him home, because he was worried about Lee Sun Jae. Lee Sun Jae had disturbed a ballet instructor at a local ballet academy after having an emotional encounter with Oh Hye Won. When Joon Hyung tried to drink with Lee Sun Jae, Oh Hye Won told Lee Sun Jae not to drink, because she did not want him to get tipsy and say something about her relationship with him. When Lee Sun Jae said "yes," Oh Hye Won said, "That's nice," and tried to walk away from him. But he stopped her and asked her, "Why did you get mad at me that night? How do you not remember?" And asked about that night when they shared a kiss. Lee Sun Jae then said to Oh Hye Won, "I did a lot of thinking," and called her out that her attitude is very confusing to him. In related news, cable channel JTBC's drama titled "Secret Love Affair" is a story of a forty something woman, Oh Hye Won, who is played by actress Kim Hee Ae, and a naïve genius pianist Lee Sun Jae, played by actor Yoo Ah In.