Are AKMU actually siblings?

Yes — Lee Chan-hyuk and Lee Su-hyun are brother and sister, and they were making music together even before they debuted. This list focuses on their public vocal and creative work rather than their private lives.

Are their vocal roles always fixed?

No. Depending on the song, Lee Chan-hyuk sometimes takes on quick, near-rap-paced lines while Lee Su-hyun carries the chorus, and just as often the reverse happens. That flexibility is part of what defines AKMU's vocal sound.

What should I watch for to catch how they divide roles live?

Pay attention to who starts singing first in the intro, how many times the harmony stacks up in the chorus, and the moments where they make eye contact or hand a line off to each other. Official live videos often catch these moments well with their camera work.

AKMU Sibling Vocals: 6 Songs on Lead & Harmony

Who Leads, Who Answers: Six AKMU Songs Through Sibling Harmony

Built around who opens a phrase and who picks it up, this list tracks how sibling duo AKMU divides vocal roles from song to song.

AKMU is a duo made up of an older brother and younger sister, but the two voices don't split a song the same way every time. In some tracks, Lee Chan-hyuk sets up the scene and Lee Su-hyun widens the feeling; in others, it's reversed, with Lee Su-hyun carrying the melody while Lee Chan-hyuk backs it with a lower harmony. This list picks six songs that show how differently that division of labor can play out.

Listen for who opens the scene, who picks it up and expands the feeling, and where the two voices actually overlap — not just who sings more. A single short answer line or one bar of harmony can shift the whole feel of a song.

RE-BYE

From 《Spring Part.1》, Lee Su-hyun's clear melody and Lee Chan-hyuk's rhythmic call-and-response trade off like lines in a play. One sets up a scene, the other picks up the next one — isolate each voice on a second listen and how clearly each role is defined becomes obvious. <a href="https://www.youtube.com/watch?v=ST8O-AeY3Uo" target="_blank" rel="noopener">Watch the official video</a>

People Moving

Another cut from 《Spring Part.1》, but here Lee Chan-hyuk rattles off the scene in quick lines while Lee Su-hyun layers feeling on top with a high chorus. Compare where the two voices overlap and where they split apart in the chorus — that's where the sibling chemistry really shows. <a href="https://www.youtube.com/watch?v=sbc2yBheAbo" target="_blank" rel="noopener">Watch the official video</a>

200% — Official Live

An early official live take on a track from the first album 《PLAY》, where Lee Chan-hyuk's rhythm guitar and vocal lock in with Lee Su-hyun's lead melody with all the rawness of a fresh debut. Compare it with their later live performances and how much steadier their interplay has grown over time is easy to hear. <a href="https://www.youtube.com/watch?v=FPPKIJj5lmQ" target="_blank" rel="noopener">Watch the official video</a>