Choi Ban Do and Ma Jin Joo are both 38-years-old and a married couple. Choi Ban Do has been burdened with being the breadwinner and Ma Jin Joo is a housewife with low self-esteem. Even though they loved each other when they married, they now hate each other. They both regret marrying at such a young age. The couple travel through time and find themselves as 20-year-old university students, when they met for the first time.

It tells an unpredictable 24-hour love story of the four-dimensional innocent girl Jung Saet Byeol who was once a troublemaker and the adorkable caring male store manager, Choi Dae Hyun, in the context of a convenience store. They have met each other accidentally 4 years ago, back then Saet Byeol asked Dae Hyun to buy cigarettes for them. Until now, Saet Byeol comes to the convenience store Dae Hyun runs for a part-time job, their hilarious romantic story starts.

Inevitably, everybody gets hurt at some point in their lives. There are different remedies for different types of wounds, and as time elapses, these remedies start to become less effective. This is a story about a man who created a shield for his broken heart. Since the day his heart broke, he has been living inside a shell. One day, he encounters a being unlike any other, and by interacting with her, he slowly learns how to break out of his shell.

A wealthy man and a poor stunt girl fall in love. But things get complicated when their souls become inexplicably swapped and dark secrets surface.

A former serial killer Byung-su gets diagnosed with Alzheimer’s and when a series of murders occur near his town, he worries whether the killings are his doings. Then, he comes across Tae-ju and realizes that he’s the killer. He reports this to the police, only to learn that Tae-ju is one. Byung-su tries to find evidence against Tae-ju, only to raise the young killer’s interest on him and his dear daughter.

Ae-Ra is focused on her appearance as she believes it will lead her to a better life. She then meets Jung-Woo who studied engineering. They eventually get married, but they also get divorced. After their divorce, Ae-Ra goes through difficult times. Unlike Ae-Ra though, Jung-Woo becomes a successful IT developer and very wealthy. Now, Ae-Ra tries to seduce Jung-Woo to marry her again.

A man and a woman who is only given so much time to live fall in love and resolves heart aching love into a bright and cheerful one.