Perfect Partner (Movie - 2011)

Source

Also known as "My Secret Partner"
Synopsis
A screenplay writer Jun-seok and a famed chef Hee-sook, each of them starts having sex with their own students, respectively with Yeon-hui and Min-soo on purpose for inspiration! Each of their wild and secret relationship surprisingly gives continuous inspiration to them. These two couples try to be physically affectionate even in public areas to draw more inspiration. While all Jun-seok needs from the relationship is finish his screenplay to make his splendid comeback, all his student-turned-secret lover Yeon-hui desperately wants is win a prize at the screenplay competition. Also, while Hee-sook tries to get in her second prime, her young lover Min-soo works to develop his great recipes. Will their controversial relationships indeed fulfill their needs?