K-Pop Demon Hunters Cast: Voice Actors and Singers

Arden Cho brings quiet intensity to Rumi, the lead vocalist of demon-hunting K-pop trio Huntr/x in Netflix’s K-Pop Demon Hunters. Released June 20, 2025, the film uses a casting split that surprises even seasoned animation fans: every main character has one performer for dialogue and another for singing.

Directors: Chris Appelhans, Maggie Kang · Lead Voice: Arden Cho as Rumi · Key Voices: May Hong as Mira, Ji-young Yoo as Zoey · Rival Group: Saja Boys · Platform: Netflix

The Huntr/x trio faces off against the Saja Boys in a story where musical authenticity matters as much as action. Here’s what we know about who voices and sings for each character.

Do the voice actors in KPop Demon Hunters actually sing?

No—the voice actors handle dialogue, while separate singers provide all the musical performances. The production team deliberately built this dual-casting system to ensure both dialogue and singing received expert attention.

Saja Boys singing roles

The five Saja Boys members each have an actor for speaking lines and a different performer for singing. Ahn Hyo-seop voices Jinu, the group’s leader, but Andrew Choi provides Jinu’s singing voice. Joel Kim Booster voices Romance Saja, the flirtatious member, while Samuil Lee handles his vocals. SungWon Cho voices Abby Saja, the main dancer, and Neckwav provides his singing voice. Alan Lee voices Mystery Saja, and Kevin Woo, a real K-pop singer, provides his vocals. Danny Chung both voices and sings for Baby Saja, the youngest member.

Rumi dual voices

Arden Cho provides Rumi’s speaking voice, but Rei Ami, a Korean-American singer, delivers her musical performances. According to Voquent (voice casting industry coverage), this split ensures Rumi sounds equally confident whether having a casual conversation or performing a high-energy stage number. The pattern mirrors the Saja Boys approach: dialogue actors focus purely on acting while singers concentrate on musical delivery.

Who voiced the Saja Boys?

The Saja Boys voice cast mixes professional voice actors with actors from other entertainment backgrounds. Each performer brings a distinct style that shapes how audiences perceive these demon musicians.

Saja Boys cast details

According to Wikipedia (film encyclopedia), the cast includes Ahn Hyo-seop as Jinu, Joel Kim Booster as Romance Saja, SungWon Cho as Abby Saja, and Alan Lee as Mystery Saja. Danny Chung voices and sings Baby Saja, the youngest member. Jinu’s design includes a blue pet tiger and a six-eyed magpie inspired by Korean minhwa art—a visual choice that connects his character to Korean cultural aesthetics beyond standard demon imagery.

Real singers status

The Saja Boys are a five-member fictional project boy group created for the Netflix film, per K-pop Fandom Wiki (K-pop community resource). However, several singers behind the voices are actual music professionals. Andrew Choi, Jinu’s singing voice, wasn’t originally meant for the role—he impressed producers during the casting process and was offered the position. Kevin Woo works as a K-pop singer outside this project, lending authenticity to Mystery Saja’s musical performances. The production explicitly recruited real singers to handle the vocal performances.

Who is Rumi’s singing voice?

Rei Ami provides Rumi’s singing voice. The Korean-American singer handles all musical performances for the film’s central protagonist, allowing Arden Cho to focus entirely on the character’s dialogue and emotional delivery.

Arden Cho role

Arden Cho voices Rumi, the lead vocalist of Huntr/x and the film’s central protagonist. According to Voquent, she connected deeply with Rumi’s struggles around identity and belonging—themes that resonate with Cho’s own experiences navigating Korean-American identity in the entertainment industry. Her performance emphasizes Rumi’s journey of self-discovery as she learns to balance her musical career with her demon-hunting duties. The dual-voice system meant she could concentrate on acting without the pressure of delivering studio-quality vocals simultaneously.

Rei Ami contribution

Rei Ami brings professional singing credentials to the role. The production’s choice to cast a dedicated singer for Rumi’s musical moments reflects a broader strategy: separate acting from singing to maximize quality in both domains. For high-energy dance sequences and emotional ballads, audiences hear Rei Ami’s trained voice rather than an actor approximating musical performance.

Is anyone from the cast from a K-pop band?

No current K-pop idol group members appear in the cast, but several performers have legitimate ties to Korean entertainment. The distinction matters for fans expecting traditional idol involvement.

K-pop ties

Yunjin Kim voices Celine, a former demon hunter and K-pop idol who fosters Rumi, with Lea Salonga providing her singing voice. Yunjin Kim, formerly of the K-pop group Sistar, brings actual idol experience to the role—even though she’s acting here, her background shapes how she approaches the character. Lea Salonga, known for her Tony Award-winning Broadway career, provides vocal performances that meet the demanding standards of animated musical sequences. Wikipedia confirms both casting decisions.

Katseye clarification

Katseye, the K-pop adjacent girl group formed by Hybe and Interscope Records, has no connection to this film. The groups operate independently—one is a real performing act, the other exists within an animated narrative. Some viewers confuse them because both represent modern approaches to K-pop, but they share no cast members or creative team overlap.

Are the Saja Boys real singers?

Inside the story, the Saja Boys are demons disguised as pop stars. Outside the story, the singers behind their voices include real music professionals who have since performed as a group beyond the film.

Voice actors vs singers

The dual-casting system means voice actors and singers serve different roles. Actors like Joel Kim Booster and SungWon Cho provide comedic timing and character voice work for dialogue scenes. Singers like Andrew Choi and Kevin Woo deliver polished musical performances for stage sequences. The production deliberately separates these skills because excellent voice acting doesn’t automatically translate to excellent singing—and vice versa.

Post-release band

According to GMA Network (entertainment news), the Saja Boys have continued performing after the film’s release. What started as fictional characters designed for an animated story became a real musical project. This progression mirrors how some animated musical projects generate actual soundtracks with performing artists—except here, the fictional framework itself inspired real-world performances.

Arden Cho told Netflix

She connected deeply with Rumi’s struggles around identity and belonging, describing the role as a journey of self-discovery.

Andrew Choi told producers

He was not originally meant to be Jinu’s singing voice but impressed them enough to be offered the role.

For viewers seeking authentic K-pop idol involvement, the dual-casting structure may feel unexpected. But for anyone curious about how animated productions create convincing musical performances, the separation of speaking and singing roles offers a behind-the-scenes look at professional production strategy. The result sounds polished because specialists handle each component rather than expecting one performer to excel at both.

Related reading: Stranger Things Season 5 Cast · Mean Girls Musical Cast Guide

The K-Pop Demon Hunters production employs separate speaking and singing voices for its stars like Arden Cho and the Saja Boys, blending acting with authentic K-pop performance.