In the K-pop jungle, where reinvention can move almost as quickly as fast fashion, surviving a decade is something to celebrate. The latest to cross that threshold is NCT 127. Nearly every patch of shade around Seoul's KSPO Dome had been claimed three hours before NCT 127 was due onstage Sunday. Fans sat beneath trees and along concrete walls with photo cards, merchandise and lightsticks spread around them, trading collectibles and talki