Kim Seo-Jin is a man who is driven only to achieve success in his life. Thanks to his efforts, he is the youngest executive at his company. His life is perfect, with his beautiful violinist wife Kang Hyun-Chae and a daughter. His wonderful life comes to a halt when his young daughter is kidnapped. He falls deep into despair. To change the past, when his daughter was kidnapped, he contacts Han Ae-Ri approximately one month in the past.
Han Ae-Ri has busy days with her studies and working a part-time job to make enough money to pay for her sick mother's operation. One day, her mother suddenly goes missing. Han Ae-Ri falls into despair, when Kim Seo-Jin from the future contacts her.
Although its earlier parts were much better than the rest but the initial set up needed more time and thoughts to be put into it. They wanted to kick start the premise quickly but they rushed things along the way. The first 5-6 episodes kept you interested about the plot and had a good amount of thriller but things slowed down significantly after that and it began to lose its attraction even when they attempted to add story-altering twists. The story itself got sloppier for no reason in the second half and the villains turned out to be underwhelming. The characters never felt like they had a good dynamic or chemistry going on, not even with the most obvious main mother-daughter or father-daughter relationship. Their lack of appeal made it hard to root for anyone. Something was missing, none of them clicked.