Lee Sungyeol is a famous Radio DJ in a famous channel, Moonlight Radio. On radio, he refers to himself as Love Doctor Lee. No one knows his true identity but he had caught everyone's heart just by his sweet cheerful voice. A lot of people adore him, especially girls. They had been trying so hard to find some information about him but they got nothing. He is too mysterious. Less they know, Sungyeol keeps a big secret that only people surrounds him know.

One day a drunk man named Kim Myungsoo accidentally makes a call to his radio channel and blabbering about his marriage life. It leads them from strangers to another level that would change their life forever.