If a Mistake Is Made It Cannot Be Undone

Are he and her childhood sweethearts, or did they fall in love at first sight? How can he escape from the entanglement of love? How can she avoid the passage of time? Does he choose revenge or friendship and family affection? Does she choose her brother or her mother? The love-hate entanglement of six people and the conflict of interests of three families. How do they interpret extraordinary lives? Who wins this love and family? If it's just a mistake, how can you make it right? If it can't be undone, then... So be it.