And all about girl power according to Dramabeans. Judging by the trailer, my first impression is of a comic version of the excellent Take Care of my Cat (2001; 고양이를 부탁해).
According to HanCinema, it’s a documentary about a Cuban man who falls in love with a Korean woman 10 years his senior. Unfortunately there’s little information available about it in English, but it does looks interesting.
And for more on many elderly men’s reliance on prostitution, the Korean public’s attitudes to elderly sexuality, and depictions of that in popular culture, see here.