Yun-lee is a girl who has a big emotional scar in her middle. Thanks to an accident, she lost two precious years of her life between 19 and 21 years of age. Her entire life is void. She’s miserable, so she’s always going to a preparatory school, hoping to keep up with all the time she’s spent. Suddenly, one day on her way to feed some stray cats, she comes across a young man who appears to have lost… a time between the ages of 19 and 21.