Park Eun-jin, a boisterous woman in her thirties, has a dismal history with romantic entanglements. Her carefree and adventurous spirit often leads her to be irresponsible and impulsive, alienating those who are more reserved and cautious. Despite this, she is drawn to romantic fantasies, even if they involve overlooking significant issues like her partner’s marital status. Following a dramatic breakup with a colleague, Eun-jin ends up sharing a taxi with Kim Hyeon-seok, a socially awkward and nerdy young man. Surprisingly, they start dating and eventually decide to tie the knot. However, one evening, Eun-jin discovers a questionable text message on Hyeon-seok’s phone. Infuriated, she recruits her police officer friend So-young and her clumsy ex-marine brother Eun-gyul to investigate what she believes is Hyeon-seok’s infidelity. What she uncovers, however, is something entirely unexpected.