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Episodes: 12
In order to save her father from an accident, 26-years-old Kim Hye Ja uses a mysterious watch to rewind time in an attempt to prevent the accident, but fails. Desperate, she ends up rewinding the watch too many times and accidently aging herself, becoming a 70-years-old.
Confused and oblivious as to how she ended up like this, she sets on a journey to put everything back on track. Along the way, she encounters her family and friends who now do not recognize her, including Lee Joon Ha, a young man she loved, who yearns for her while struggling with his life.
When 70-years-old Kim Hye Ja and the young Lee Joon Ha come together to form an unlikely bond, a devastating and life-turning truth is revealed, the crux of all the time she lost.
13-years-old Ne Mo, who was born from a single mother, dreams of marrying a single mother. After the sudden death of his mother, the store which his mom operated is rented by Boo Ja, who is also a single mother. Boo Ja lives with her son Ki Cheol. Ne Mo feels that Boo Ja is part of his fate and, even though he is only 13-years-old, he proposes to her.
One day, Ne Mo, Boo Ja, and Ki Cheol all go to the theater together to watch a movie. A fire erupts in the theater and Ki Cheol becomes trapped inside. No Me runs back into the theater to save Ki Cheol. Ki Cheol is rescued, but Ne Mo goes missing. The next moment, Ne Mo wakes up and sees two men arguing.
Ne Mo wakes up 20 days later. He isn't 13-years-old anymore and is actually 33-years-old. Even though Ne Mo went to heaven too early, he can't go back to the regular world due to rules in heaven. Ne Mo then makes a deal with the Angel of Death. The deal is that one day for Ne Mo will equal one year. He has 60 days on Earth, but those 60 days are really 60 years to him. Ne Mo can only live until Christmas and he now begins his quest for love.
Min Ah discovers a scarlet-covered diary as she is hurrying to school. She has a brief hallucinatory experience when she opens it, initiating a series of strange occurrences which eventually draw Min Ah into the eerie world of the diary. In her desire to find out more about the diary, Min Ah feigns an illness, getting permission to lie down in the school's clinic.
There she witnesses the reunion of Hyo Shin and Shi Eun. The day in the girls' high school is half over, and the students are preoccupied with the trauma of getting their physical checkups. Suddenly their hustle and bustle are abruptly interrupted by a sharp scream which announces the death of Hyo Shin. Soon, her ghostly entity will linger over everyone's secret.