On one of Seoul’s hottest summer nights of August, winter arrived at Charlotte Theater. An hour before the Korean premiere of Disney’s “Frozen,” the theater lobby was already humming with families, couples, friends and solo musical fans. Long lines formed at the merchandise shop and in front of a call board and photo zone featuring a towering ice sculpture and illuminated snowflakes. Children in Elsa capes, sparkling crowns and princess shoes waited patiently beside adults eager to document the long-awaited arrival of the global musical hit. The sold-out audience came for snow and spectacle. It received both — along with a polished Korean production anchored by powerhouse turns from Jung Sun-ah as Elsa and Park Jin-joo as Anna. Based on Disney’s 2013 animated film, “Frozen” follows the estranged royal sisters Elsa and Anna. Elsa, terrified that her power to freeze everything around her will hurt those she loves, retreats into isolation. Anna sets out to save both her sister and the kingdom of Arendelle from an endless winter. The stage musical, which premiered on Broadway