'Gangnam style' sex crime: K-pop scandals uncover dark side of Seoul's flashiest district

South Korean singer Jung Joon-young arrives for questioning on accusations of illicitly taping and sharing sex videos on social media, at the Seoul Metropolitan Police Agency in Seoul, South Korea. [Reuters]

On a recent weekend night, the dance floor at one of the hottest clubs in Seoul’s swanky Gangnam district held only a few dozen people surrounded by mostly empty tables.

A few months ago, the nightclub would have been packed with hundreds of gyrating men and women, and full tables, many costing 650,000 won ($570) or more for a night of drinking and dancing.