Becoming a "classic" is less a moment than a process — a long, uneven accumulation of revisions, failures and returns. Many of the works we now consider classics also required time to mature. "Swan Lake" was dismissed at its 1877 premiere and only entered the canon after years of reworking; "The Nutcracker," first staged in 1892, met a similarly chilly reception before becoming a seasonal staple. In ballet, as in all performing arts, endurance is earned over time. Now, in Korea, a homegrown work