"KPop Demon Hunters" fans were in for a major surprise Saturday when cast members Rei Ami and Kevin Woo popped up in NYC and led a sing-along to "How It's Done," the intro song to the Netflix hit. The surprise performance was part of a series of "K-Pop Demon Hunters Golden Weekend" events.

Mark Sonnenblick, who wrote "Golden" for Sony and Netflix’s 'Kpop Demon Hunters,' has signed with Kraft-Engel Management and PAL PR.