"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.

The sing-along version of the Netflix film topped the box office this weekend, grossing an estimated $18 million to $20 million.

KPop Demon Hunters will release its sing-along version on Netflix tonight. The release follows a weekend event in theaters, which drew significant attention worldwide.