"That's never happened to me before," Seulgi shares onstage at the New Jersey Performing Arts Center in Newark. She's just asked a crowd of about 3,000 people if anyone noticed one of her hair extensions fell out while she performed "Rookie" with her fellow members of Red Velvet.

Slowly but surely, a row of hair separated from Seulgi's half-up hairstyle, causing the K-pop group's leader, Irene, to laugh so hard she could hardly follow the song's trademark choreography. My friend Lai, who was sitting next to me, quickly realized what was happening and pointed out Seulgi tossing her hair extension aside.

About two hours prior to Red Velvet taking the stage — and Seulgi's extension mishap — I joined the group backstage for a quick interview. No matter what we would start to discuss, the conversation just kept going back to hair. But let's be real, their hair was the true beauty highlight of the Redmare in USA Tour, the first time Red Velvet has ever toured in America. Girl groups have rarely done so, despite K-pop's skyrocketing popularity in the U.S., making this even more monumental.

Malfunctions aside, the quintet constantly changed out their hair accessories along with their outfits throughout the show. (And the assortment changed for each stop on the tour.) Irene has given me a heads-up that this would happen. She adorned her high ponytail with ornate bows, bunny ears, and a tulle flower. Yeri, who is sitting in a chair beside her, points to the pastel bobby pins stacked on the left side of her middle-parted hair as her favorite look. At one point, Yeri switched them out for a diamond-studded headband. Wendy, on the other hand, topped her bob with a white tulle bow at one point.

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The Debut of Major Haircuts

Since Red Velvet debuted in 2014, Wendy has had long, flowing hair with bangs in a range of hues, including turquoise, platinum, crimson, and amethyst. However, Seulgi points out that Wendy just cut her hair. Now, it sits at her shoulders in a coffee shade. "I think Wendy looks really great with short hair," Seulgi tells me. When paired with white outfits, like the feather-lined dress Wendy slipped on for songs like "Zoo" and "Mr. E," Seulgi says that the new style makes Wendy look even more charming and angelic.