An unappreciated old granny magically turns 20 years old again and decides to make the most of her newfound youth.

The news anchor 'Soo-gyeong' unexpectedly meets up with her childhood friend 'Mi-soo'. Back when they were teenagers, they went to the baseball park and disappeared without a trace leaving only Soo-gyeong's painful memories of Mi-soo. And now, meeting Mi-soo again the once lively young girl has become someone completely different. Passing time together with her boyfriend 'Dong-min' Mi-soo's strange attitude starts to worry Soo-gyeong so that she pushes herself away and worries about how close Mi-soo and Dong-min have become...