Bank employee Cha Joo-hyuk is dissatisfied with his life: his career is not going well, his children keep him up at night, and his wife no longer evokes any feelings except irritation. Desperate, he decides to get a divorce, but on his way home, his car miraculously transports him back 12 years, to the day he was late for a date with his first love and met his future wife. Joo-hyuk seizes the opportunity to change everything and wakes up in a completely different present. Now his marriage is perfect, and everyone at work respects him - but it seems that happiness has remained in the alternative reality after all.