Secret Affair () is a 2014 South Korean television series starring Kim Hee-ae and Yoo Ah-in. It aired on cable channel JTBC from March 17 to May 13, 2014, on Mondays and Tuesdays at 21:50 (KST) for 16 episodes.
A story about a married woman in her 40s who has an affair with a pianist in his 20s, the romance melodrama explores the struggle between attraction and societal expectation.
Oh Hye-won (Kim Hee-ae) is a 40-year-old woman who feels that she's leading a fulfilling life. Elegant, sophisticated and excellent at dealing with people, she spares no effort in her quest for success as the director of planning for the Seohan Arts Foundation. But then she meets Lee Sun-jae (Yoo Ah-in), a 20-year-old genius pianist from an impoverished background, who is unaware of his ability and works as a quick delivery guy. Hye-won experiences for the first time what truly falling in love is like, and she and Sun-jae begin a passionate affair which they must keep secret because it threatens to unravel both their lives.