From a converted storeroom on the roof of his mother's Seoul apartment, Kim Min-kyo plays video games for up to 15 hours a day -- and makes a fortune from the thousands of fans watching him.

Livestreamers, known as "Broadcast Jockeys" or BJs in South Korea, are hard-wired to the digital infrastructure of youth culture.

They entertain for hours with an interactive mishmash of chat, gaming, dance, music, eating, getting drunk or even just sleeping.

Top livestreamers enjoy subculture celebrity among teens and 20-somethings, who consider them more relatable than traditional media stars.