The film is about "people who are dissatisfied with the country carrying out a kidnapping plan and take revenge toward the people who reign over them", according to Korea Media Rating Board (KMRB). "Regarding the images, it included heavily violent content throughout the whole film", said an official from KMRB, explaining the R-rating and why they prohibit people under 18 from seeing the movie.
DramaCool is the best site to watch One on One (2014)
English Subbed online in HD quality. You can also find Korean
drama on DramaCool website.