Haeryun Kang is the creative director of videocusIN, a media incubator in Seoul. Her most recent short film is "Color of Rage: The Nth Room."
You might not know if you were sitting next to an "nth room" criminal on the subway in Seoul, even if he was committing a crime at that very moment. All it would look like is a man typing on his phone, scrolling down, snickering, smiling.