Plot synopsis: Park Han Byul and Park Kwang Hyun star in this bubbly drama about a committed couple who realize they might not belong together at all. Jeong-seok and Yeo-kyung have been dating for years. Jeong-seok is uncultured and poor, while Yeo-kyung is polished and rich. They both begin to feel dissatisfied, and then they both meet someone else. Can true love overcome habit? Couple Breaking is a light-hearted four-episode mini about romantic switcheroos.