The Demo Singer Who Ended Up With the Number One Record

Westfield, a Tuesday, somewhere between the phone shop and the food court. Four kids, maybe ten years old, sitting on the floor against a pillar with one phone between them. They were not playing the song. They were doing the song, all four parts, and they had split the harmony properly. One of them was on the low line and hating it.

I stood there like an idiot for a full minute.

You have heard “Golden” whether you chose to or not. It has been over a year of this. And the thing I keep coming back to is not that a cartoon put a song at number one. Cartoons have done that before. It is who was actually singing.

The credit that got buried

KPop Demon Hunters went up on Netflix on 20 June 2025, 95 minutes, made by Sony Pictures Animation on a reported budget north of $100 million, directed by Maggie Kang and Chris Appelhans. It took 325.1 million views in its first 91 days and passed 500 million by the end of the year, which makes it the most-watched thing the service has ever put out. There were two theatrical sing-along runs, one in August and one over Halloween, roughly 1,700 screens, about $19.2 million taken at the American box office by a film everybody already owned.

Then in March 2026 it won Best Animated Feature at the Academy Awards, and “Golden” won Best Original Song, and the names read out for the song were Ejae, Mark Sonnenblick, Joong Gyu Kwak, Yu Han Lee, Hee Dong Nam, Jeong Hoon Seo and Teddy Park.

Teddy Park is the one people recognise. The Black Label, 2NE1, BLACKPINK, a producer with a decade of chart evidence behind him.

Ejae is the one who matters here.

What a demo singer actually does

Kim Eun-jae, who works as EJAE, is a songwriter. Before that she was a trainee. In between she spent years doing the job that keeps the K-pop machine running and never appears on the front of anything: writing toplines and cutting the demo, singing the song the way it is supposed to sound so that an agency can hear it and hand it to an idol who will then sing it in public forever.

You write the melody. You sing it better than the person who will release it, because you have to, because the demo has to sell the song in one listen. Then somebody else’s face goes on the sleeve.

On this film she cut all of it herself. Lead, harmonies, backgrounds, and the male parts too, standing in for characters she was not going to voice, because that is what a demo is.

Except this time the demo stayed.

Rumi speaks with Arden Cho’s voice and sings with EJAE’s. Mira is May Hong and Audrey Nuna. Zoey is Ji-young Yoo and Rei Ami. Splitting speaking and singing is standard practice in animation and nobody should pretend otherwise. What is not standard is that the singing half of that split ended up holding a Grammy, a Golden Globe and an Oscar for a song credited to a band of three drawings.

Why the songs land and the pastiche ones do not

Here is the technical reason it worked, and it is not complicated.

Films about pop music almost always write around the music. They write a song that signals “this is a hit” without being one, because the scene only needs the audience to accept that the crowd is going mad. The song is a prop. You can hear the prop-ness immediately: the too-generic hook, the mix that sits back, the arrangement built to duck under dialogue.

“Golden” is not built to duck under anything. It is a real K-pop record, produced by people who make real K-pop records, with the actual structural furniture: the pre-chorus that climbs and then drops out entirely, the post-chorus hook that is shorter and stickier than the chorus, the key lift in the final section handled without embarrassment. The belted note near the end is the kind of thing an A&R would ask a demo singer to do twice, once for real and once for insurance.

Put that in a film and something interesting happens to the film. The performance scenes stop being about whether the crowd is convinced and start being about whether the singer can get through it, which is a much better dramatic question, and which is the actual subject of the movie.

The joke the movie is making about itself

Because KPop Demon Hunters is a story about a girl who has to perform a version of herself in front of millions of people while hiding what she actually is. Rumi’s whole arc is the gap between the voice everyone loves and the person producing it.

A demo singer sang that.

I do not think Kang and Appelhans planned that resonance. I think they wanted a demon-hunting girl group and the best available songwriting team, and the rest is one of those accidents that a film gets to keep. But the accident is the reason the thing has legs. There is a real feeling underneath the neon and the tiger and the gags, and the feeling was supplied by somebody who had lived the exact structural situation the plot invents.

Ken Jeong and Lee Byung-hun are very funny in it. Ahn Hyo-seop’s Jinu is better written than the boy-band-rival slot required. The film took ten Annie Awards, which is a craft body voting for craft, and the animation deserves it: the goofy-face gag vocabulary lifted from webtoon and Korean variety television is the most confident visual choice in mainstream animation since the Spider-Verse films opened the door.

But none of that is why four kids were on the floor at Westfield working out the harmony.

They were there because the song is a song. Somebody wrote it properly and then sang it properly, and for once nobody took it away from her and gave it to a face.

The kid on the low line will get over it.