A young married couple, Irene and Seulgi, have a joke between them: If anything ever happen

  The couples Bae Irene and Kang Seulgi, Shon Wendy and Park Joy, are door neighbors in the building where they live, the New York Drive located in New York City. Otherwise, their lives would be forever entwined by the fact that real estate agent Bae Irene being Joy's ex-wife, and career partner with whom she lives competing and fighting; and dentist Wendy