A highly respected and brilliant doctor, Gong Ma Sung (Choi Jin Hyuk), gets into a car accident, and as a result suffers from a memory loss disorder that causes his memories to disappear every night after twelve o'clock. He wakes up every day with no recollection of the past, so every morning he reads back and memorizes his notes of all the events that happened the day before. Then one day, he meets Joo Gi Bbeum (Song Ha Yoon), a once-popular star, and they fall in love with each other. How will he keep their relationship if he forgets everything the next day?
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