One unexpected decision might completely transform your life. Cha Joo Hyuk is a bank employee with a five-year marriage to Seo Woo Jin. When a bizarre incident occurs one day, Joo Hyuk makes a decision that has unanticipated consequences for him and others around him. Suddenly, his existence with Woo Jin and his best buddy, Yoon Joong Hoo, is over, and he is living a completely different life. What role will Lee Hee Won, his first love, play in his new life? Is it conceivable for him to reclaim his previous life?