Cha Joohyeok works at a bank and has been married to Seo Woojin for five years. When a strange incident happens one day, Joohyeok makes a decision that impacts his life and those around him in unexpected ways. Suddenly, the life he had with Woojin and his best friend, Yoon Jonghoo, is gone, and he is leading a very different life. How will his first love, Lee Hyewon, factor into his new life? And will it be possible to get his old life back?