'Secret Love Affair' Yoo Ah In indirectly told his friend and girlfriend that Kim Hee Ae is the only person he can think of.

On the ninth episode of the cable channel JTBC's "Secret Love Affair" which aired on April 14, 2014, when Oh Hye Won, played by Kim Hee Ae, and Lee Sun Jae, played by Yoo Ah In, were having a secret getaway at Lee Sun Jae's house, Lee Sun Jae's friends came over. Oh Hye Won went on to hide in the attic, and Lee Sun Jae greeted his friends. Before his friends came over, Lee Sun Jae and Oh Hye Won had a romantic time together, kissing each other and looking at the night scenery of Seoul in the rooftop. While Lee Sun Jae and Oh Hye Won are getting closer to each other, people around Lee Sun Jae and Oh Hye Won are starting to realize more and more about the two's dangerous relationship. 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.