Derailed (2016)

Jin-il, Ga-young, Bong-gil, and Min-kyung are teenage runaways who live together as a family. Jin-il is the leader of the group, earning money by selling stolen goods. As it gets harder to make a living for 4 of them, they plan even more dangerous crimes to survive the cruel society where they have no protection from the adults. One day, the kids steal a car from Hyung-Seok, a karaoke owner who illegally uses underage girls as prostitutes. Outrageous Hyung-Seok tracks them down with his men and forces Ga-young to work at his karaoke bar until they pay back for his car. Even worse, the two friends give up making money and now Jin-il struggles alone to save Ga-young…