K-Pop Demon Hunters Sing Cast: What Most People Get Wrong About the Voices

If you’ve spent any time on Netflix recently, you’ve probably seen the neon-soaked, demon-slashing chaos that is K-Pop: Demon Hunters. It’s a total trip. One minute you're watching a world-class girl group sell out a stadium, and the next, they’re pulling out spirit blades to decapitate monsters.

But honestly? The biggest surprise isn't the plot. It’s the voices.

People keep searching for the K-Pop Demon Hunters sing cast because there is a very specific, almost confusing trick the movie plays on your ears. You see, the person talking isn't always the person singing. Sony Pictures Animation decided to go with a "dual-cast" approach for the main trio, HUNTR/X, and the rival Saja Boys. It’s a move that makes the musical numbers feel like actual chart-topping hits rather than just "movie songs."

The Secret Voices Behind HUNTR/X

Let’s look at Rumi. She’s the leader, she’s fierce, and she’s voiced by Arden Cho. You know Arden—she was Kira in Teen Wolf and has been everywhere from Partner Track to Chicago Med. She brings this grounded, older-sister energy to Rumi that makes the character's internal struggle with her half-demon heritage feel real.

But when Rumi hits those high notes in "Golden"? That’s not Arden.

That’s EJAE.

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EJAE is a powerhouse vocal producer who has worked behind the scenes with K-pop royalty like aespa and LE SSERAFIM. By splitting the role, the directors (Maggie Kang and Chris Appelhans) let Arden handle the heavy emotional acting while EJAE provided the professional-grade K-pop polish. It’s a weirdly effective combo.

The rest of the group follows the same pattern:

• Mira: Voiced by May Hong (Hacks). She’s the "tomboy" of the group, tough but sensitive. Her singing, however, comes from Audrey Nuna. If you’ve heard "Damn Right," you know Audrey's vibe is perfect for Mira’s sharp, rhythmic style.
• Zoey: Ji-young Yoo (Expats) provides the speaking voice. Zoey is the high-energy rapper who moved from California to Seoul. Her singing and rap bars are handled by Rei Ami, the artist behind the viral TikTok hit "Freak."

Why the K-Pop Demon Hunters Sing Cast Matters

Most animated movies just have the actor sing. Sometimes it works (think Disney), but K-pop is a different beast. It requires a very specific vocal texture.

Director Maggie Kang was pretty adamant about authenticity. She didn't just want actors who could carry a tune; she wanted the sound of the industry. This is why the K-Pop Demon Hunters sing cast includes people like Andrew Choi and Danny Chung.

Andrew Choi voices the singing parts for Jinu, the leader of the Saja Boys (the speaking voice is the legendary Ahn Hyo-seop). Choi isn't just a singer; he’s written tracks for SHINee and EXO. He understands the "breathiness" and the precision that makes a K-pop boy band song sound like... well, a K-pop boy band song.

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The Legend in the Booth: Lea Salonga

Then there’s Celine. She’s the mentor, the former demon hunter who trained the girls.

The casting here is a total flex.

Yunjin Kim (Lost) does the speaking, but the singing? That’s Lea Salonga. Yes, the actual voice of Disney’s Mulan and Jasmine. Having a literal Broadway and Disney legend in the K-Pop Demon Hunters sing cast adds a layer of "prestige" that balances out the modern, edgy R&B sounds of the younger characters. It’s a nod to the "older generation" of hunters, and honestly, Salonga’s voice is still untouchable.

The Boys are (Demon) King

We can't talk about this cast without mentioning the Saja Boys. They’re the "villains" who are actually ancient demons working for Gwi-Ma (voiced by Lee Byung-hun).

Jinu is the standout. Ahn Hyo-seop—who basically owns the K-drama world right now after Business Proposal—makes his English voice acting debut here. He’s got this cool, detached vibe that works perfectly for a centuries-old demon musician.

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The Saja Boys' lineup is a mix of actors and K-pop veterans:

1. Abby Saja: Voiced by SungWon Cho (the YouTuber ProZD). He’s the "muscle" of the group. His singing voice is Neckwav, a Seoul-based composer.
2. Romance Saja: Voiced by Joel Kim Booster. He’s the flirt. His singing? SamUIL Lee, who has worked with NCT Dream and Seventeen.
3. Baby Saja: This character doesn't even speak—he only raps. The voice belongs to Danny Chung, a songwriter from THEBLACKLABEL who has penned lyrics for BLACKPINK.

Real Talk: Does This "Split Casting" Work?

Some people find it jarring. You’re listening to Arden Cho’s voice for twenty minutes, then suddenly the singing voice has a slightly different timbre.

But if you look at how the film performed, the strategy clearly paid off. Seven tracks from the movie hit the Billboard charts. That doesn't happen with standard musical theater-style animation. By using real K-pop producers and singers like EJAE and Andrew Choi, Sony created a soundtrack that people actually want to stream on Spotify next to NewJeans or BTS.

It’s about "vibe" more than "matching."

The movie treats the music as a weapon. In the lore, their voices are literally what seals the "Honmoon" (the magical barrier). If the singing didn't sound powerful and professional, the stakes of the fight scenes would totally collapse.

What You Should Do Next

If you’ve only watched the movie with your TV speakers, you’re missing half the detail. The production on these tracks is insane.

1. Listen to the Soundtrack Solo: Put on some good headphones and listen to "Golden" or "Your Idol." You’ll hear the layers that Teddy Park (BLACKPINK's producer) put into the mix.
2. Watch the "Making Of" Clips: Netflix has released some behind-the-scenes footage of the recording sessions. Watching the singers and actors collaborate to match the "breath" and "energy" of a single character is fascinating.
3. Check out the Singers' Solo Work: If you liked Mira’s songs, go listen to Audrey Nuna’s album A Liquid Breakfast. If you liked Rumi’s vocals, look up EJAE’s credits. You’ll realize you’ve probably been listening to her work for years without knowing it.

The K-Pop Demon Hunters sing cast is a weird, hybrid experiment that shouldn't work, but it does. It’s a love letter to the industry that doesn't just copy the aesthetic—it hires the people who actually built it.