K-Pop Demon Hunters Cast: Speaking & Singing Voices

Netflix’s K-Pop Demon Hunters runs two entirely separate casts: one for speaking, one for singing—a split-casting approach that gives the June 2025 animated film its polished musical numbers while keeping character performances grounded.

Release Year: 2025 ·
Directors: Chris Appelhans, Maggie Kang ·
Lead Voice Actress: Arden Cho as Rumi ·
Girl Group: Huntrix ·
Rival Boy Band: Saja Boys (demons)

The table below consolidates key details about this animated film and its cast.

Do the voice actors in KPop Demon Hunters actually sing?

For most characters, no—the film’s production splits speaking and singing into two entirely different performers. This is a common technique in animated musicals where actors may excel at dialogue delivery but lack the vocal range for K-pop standards, or vice versa. Huntrix and the Saja Boys both benefit from this separation, allowing each department to specialize.

Speaking roles vs singing performances

The speaking cast pulls from actors known for dialogue work: Arden Cho handles Rumi’s voice, May Hong takes Mira, and Joel Kim Booster voices Romance Saja. Each brings distinct comedic timing or dramatic weight to their roles. The singing cast, meanwhile, consists of professional vocalists—many with existing K-pop or music backgrounds—who deliver the group’s performance-ready tracks.

• Rumi speaking voice: Arden Cho / Singing: separate Huntrix vocalist
• Mira speaking voice: May Hong / Singing: Audrey Nuna, EJAE, Rei Ami for some tracks
• Jinu speaking voice: Ahn Hyo-seop / Singing: Andrew Choi
• Abby Saja speaking voice: Sungwon Cho / Singing: Neckwav
• Romance Saja speaking voice: Joel Kim Booster / Singing: samUIL Lee
• Baby Saja: Danny Chung handles both speaking and singing duties

This dual-cast approach is what gives the film its polished musical numbers while keeping character performances grounded and characterful.

“Whether you’re a K-pop fan or just love animated action-comedies, Netflix’s ‘K-pop Demon Hunters’ is hard to miss.”

— GMA Network, Entertainment Writer

Who voices Saja Boys?

The Saja Boys cast blends Hollywood voice actors, K-drama stars, and entertainers. The five-member demonic boy band features one of the more diverse casting setups in recent animated film, mixing established comedy voices with rising K-pop talent.

Main Saja Boys members

The table below lists each character with their speaking and singing performers.

Ahn Hyo-seop’s casting as Jinu marks his first major voice acting role, bringing his K-drama presence to the demonic leader. Joel Kim Booster, known for Fire Island and Bojack Horseman, takes on Romance Saja—described as charming, larger-than-life, but sneaky. Sungwon Cho (Prozd) brings his online comedy persona to Abby Saja, while Alan Lee has credits spanning Solo Leveling, One Piece, and Scott Pilgrim Takes Off.

Demon boy band details

The Saja Boys serve as the film’s antagonists—demons sent by dark lord Gwi-ma to infiltrate the human world through K-pop. Their mission: steal fans’ souls under the guise of idol worship. Onstage they perform perfectly polished routines; offstage, their demonic nature emerges. Mystery Saja never shows his face throughout the film, his identity concealed behind long silver hair—a casting quirk that required his voice actor to convey everything through tone alone.

“Since Mystery Saja never shows his face, everything about the character has to be felt through his voice.”

— YouTube Behind the Voices, Video Creator

Does Rumi have two voice actors?

Yes—Arden Cho provides Rumi’s speaking voice, but a separate singer handles the character’s musical performances. This mirrors the split casting used throughout Huntrix and applies the same principle to Rumi as to the Saja Boys.

Arden Cho’s role

Arden Cho leads the Huntrix pack as Rumi, the group’s leader and a dedicated demon hunter. Known for roles in Teen Wolf and various K-drama projects, Cho brings her established on-screen presence to her voice work. Her casting was announced alongside the film’s broader ensemble reveal, positioning her as the primary voice audiences associate with Rumi during dialogue scenes.

Singing voice distinction

Rumi’s singing voice comes from a dedicated Huntrix vocalist—professional singers recruited to deliver the group’s musical numbers with K-pop-grade polish. The exact singer for Rumi specifically isn’t listed in public credits, but Huntrix overall draws from vocalists including Audrey Nuna, EJAE, and Rei Ami for various tracks. This means Rumi’s speaking and singing performances are genuinely separate—two distinct talents for two distinct skill sets.

“Ahn Hyo-seop, the K-drama star from Business Proposal, steps into his big first voice acting role as the mysterious leader of the Saja Boys.”

— YouTube Behind the Voices, Video Creator

The catch: this opacity frustrates fans who want to track specific performers, but it reflects the reality that split casting prioritizes music quality over vocal identity continuity.

Who is singing in KPop Demon Hunters?

The singing cast behind K-Pop Demon Hunters pulls from active musicians and vocal specialists—notably different from the acting-focused speaking cast. Several have existing discographies or K-pop credentials that make their involvement a draw for music-focused fans.

Huntrix group singers

The Huntrix vocalists backing the demon-hunting girl group include Audrey Nuna, EJAE, and Rei Ami, among others contributing to various tracks. Their collective background spans solo music careers, featured vocals, and live performance work—making them more than just session singers brought in for a single project. The production reportedly selected these vocalists for their ability to deliver K-pop caliber performances without the additional acting demands placed on speaking cast members.

Golden voices behind the movie

The Saja Boys’ singing voices include Andrew Choi for Jinu (also called Genu in some clips), Neckwav for Abby Saja, Kevin Woo for Mystery Saja, and samUIL Lee for Romance Saja. Danny Chung notably handles both speaking and singing for Baby Saja—the one Saja Boy with a single performer handling all vocal duties.

• Andrew Choi: Singing voice for Jinu, delivers the leader’s most prominent vocal moments
• Neckwav (Necav): Singing voice for Abby, brings energy to dance-forward tracks
• Kevin Woo: Singing voice for Mystery, supports the group’s vocal-harmony moments
• samUIL Lee: Singing voice for Romance, adds smoothness to the group’s sweeter ballads
• Danny Chung: Dual role for Baby Saja—handles both speaking and all singing

What this means: the singers behind each track operate largely behind the scenes, without the visibility given to speaking cast members. For K-pop fans who want to know exactly who performs which song, this opacity can be frustrating.

Are the Saja Boys real singers?

In the film, the Saja Boys are demons in disguise—but post-release, they’ve become a real performing group. Netflix and the production team have maintained the Saja Boys as an actual K-pop-style act, complete with released tracks and potential live performances.

Post-movie real band formation

Following the film’s June 2025 release, reports confirm the Saja Boys now operate as a real project group. Their OST contributions—”Soda Pop” and “Your Idol”—remain available, and the group has performed at promotional events tied to the film. This mirrors a growing trend in K-pop-adjacent media where fictional groups launched through films or dramas continue as actual music acts.

Voice actors’ backgrounds

The Saja Boys’ real-world identity is complicated: the speaking cast (Ahn Hyo-seop, Sungwon Cho, Joel Kim Booster) are primarily actors and comedians, while the singing cast (Andrew Choi, Neckwav, Kevin Woo, samUIL Lee) are musicians first. When the group performs as a real act, which performers take the stage depends on the context—studio recordings feature the singers, while promotional appearances may lean on speaking cast members or a hybrid lineup.

“Since Mystery Saja never shows his face, everything about the character has to be felt through his voice.”

— YouTube Behind the Voices, Video Creator

The production’s split casting model is both the film’s biggest strength and its most persistent complication. For K-pop fans prioritizing vocal quality, it delivers industry-grade performances. For viewers who mentally link a character’s speaking voice with their singing, it requires adjustment. The Saja Boys’ post-film existence as a real group puts extra pressure on this model—if the real band succeeds with live performances, it proves the concept works beyond animation. If it struggles, the split casting will likely be cited as a contributing factor.

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This split between speaking talents like Arden Cho as Rumi and singers such as Andrew Choi extends across the voice actors overview powering Huntrix and Saja Boys.

Frequently asked questions