Young-joon and So-yeo are a young couple with their marriage relatively stable. On a day their mutual friend opens a wine bar, they come across Min-jae and Yu-na, a couple quite the opposite of themselves. After a trade of talks, Young-joon becomes a client of fashion consultant Yu-na, while hotelier Min-jae agrees to help So-yeo book a hotel for her Hong Kong business trip. So-yeo meets Min-jae by chance in Hong Kong, while Young-joon trades suggestive remarks with Yu-na who visits him on a consulting session. That night, the four of them find in the other partner what had been missing in their respective marriage.
One couple marries out of love, then falls out of love. Another couple marries without love, then fails to find love. Enter seduction. Love Now (a.k.a. Changing Partners), directed by Jung Yoon Soo (My Girl and I), revolves around the infidelities of two married couples who inadvertently engage in couple swapping. The film features the all-star casting of Uhm Jung Hwa (Seducing Mr. Perfect), Park Yong Woo (World Of Silence), Han Chae Young (Wild Card), and Lee Dong Gun (My Boyfriend Is Type B). Yoo Na (Uhm Jung Hwa) is a sexy fashion consultant who demands perfection in her work and marriage. Her husband of three years, Min Jae (Park Yong Woo), is a sensitive hotel manager with a gentle charisma. They share a connection more as friends than as a couple. So Yeo (Han Chae Young) is a sophisticated lighting designer who feels dissatisfied with her passionless marriage to workaholic Young Joon (Lee Dong Gun). Their marriage is nothing more than a legal contract. Their relationships take an unexpected turn when Young Joon meets Yoo Na during a fashion consultation, and Min Jae and So Yeo run in to each other in Hong Kong. All four become both victims and offenders in this deceptive game of love and seduction. Will they ever find out the truth about each other?