Miss Granny (2014)

Oh Mal Soon is a 74-year-old widow that realizes she is becoming a burden on her family. As she is roaming the streets, she comes across a photo studio and dresses up for a self-portrait. When she walks out, she mysteriously regains her physical appearance from the age of 20. Making the most out of this one in a lifetime opportunity, she changes her name to Oh Doo Ri and decides to enjoy the best out of her youth…