Miss Granny
수상한 그녀 (original)
After learning she's to be sent to a rest home, an elderly widow goes for a walk and wanders into a photo studio, where she emerges as a 20-year-old.
Starring Shim Eun-kyung, Lee Jin-wook, Jung Jin-young, Park In-hwan, Sung Dong-il, Na Moon-hee, Hwang Jeong-min, Kim Hyun-sook, Kim Seul-gi, Kim Seul-ki
Watch "Miss Granny" on Netflix released in 2014. It's a drama and family movie, and has a rating of 7.2 out of 10 from Imdb which is usually fine for this kind of movie.