Director Ahn Pan-seok uses moody lighting, lingering shots, and a voyeuristic camera style that makes the viewer feel like a co-conspirator in their secret. Social Commentary and Sacrifice

The 2014 Korean drama you are looking for is titled Secret Love Affair

Over the next month their meetings multiplied like stolen chapters of a book. Min-woo found reasons to visit Café Aurora, to linger by her table while she sketched faces on napkins. Hae-jin discovered that beneath his crisp suits were hands callused from late-night piano playing, a secret he revealed one twilight as rain stitched patterns on the window. He confessed a life arranged by expectation: a boardroom bride the family wanted, strategies mapped out like chess moves. She admitted she was barely keeping it together—temp jobs, a cramped studio, a stubborn need to create.

The "love affair" drama of 2014 changed Korean television. Before Secret Love Affair , a drama about adultery was usually a makjang (over-the-top revenge soap). But 2014 humanized the "other woman" and the "tortured husband."