How to Sing Like Sujeong (Lovelyz): Vocal Range, Airy Tone & the Technique Behind It

Singing like Sujeong from Lovelyz is less about matching one range number and more about controlling two things at once: how much nasal resonance you route into a note, and how gently you can start a phrase without losing pitch. That combination — not raw belting power — is what makes her lead vocal parts distinctive, and it's trainable through resonance and breath work regardless of your natural voice type.

Safety note: None of the techniques here should cause throat soreness, a pressed or squeezed feeling, or hoarseness lasting beyond 24 hours. Airy tone and nasal resonance should come from breath control and soft palate positioning, not from tightening the throat. If a phrase starts to feel effortful rather than controlled, drop the key or reduce intensity. Consult an ENT specialist for hoarseness lasting more than two weeks.

Sujeong's Vocal Profile

Ryu Su-jeong — referred to here by her full name to avoid confusion with fellow Lovelyz member Lee Su-jeong, formerly known as Babysoul — is Lovelyz's lead vocalist and one of the group's most consistently active members as a musician. Beyond group promotions, she runs her own independent label, House of Dreams (founded 2022, fully independent since 2025), and has released a steady run of solo work: the EP Tiger Eyes (2020), the full-length Archive of Emotions (2023, on which she is credited as a writer, composer, and arranger), the EP 2Rox (2024), the EP New Car (2025), and the single "Melted Love" (2025).

There is no publicly verified physiological vocal range figure for her — no independently confirmed lowest-to-highest note has been documented. Treat any specific pitch claim about her voice with caution. What is measurable instead is the demand of the songs she leads: her lead vocal parts across Lovelyz's catalog and her solo work span roughly C major to B-flat minor keys at tempos from 106 to 130 BPM, which is a more defensible way to estimate the vocal territory she works in than guessing a range figure.

Her vocal identity has two defining characteristics, both audible across her lead vocal work:

• Nasal, dreamlike tone — a deliberately thinned, airy coloring produced by routing more airflow through the nasal cavity, distinct from a fuller oral-resonance pop tone.
• Airy onset with breathy sustain — notes that begin without a hard glottal closure, giving her phrasing a soft, indie-pop-leaning texture rather than a belted one.

Sujeong's Signature Songs — by Vocal Challenge

Because no official part-by-part breakdown of Lovelyz's group songs exists, the ordering below is built from her confirmed role as lead vocalist together with each song's key and tempo — an inference, not a documented fact. Transpose any of these to a key that fits your voice.

Approach the table as a training order, not a chart of difficulty absolutes — every entry here is an approximation based on the song's key and tempo, since no official vocal-range measurement exists for these tracks. "Tiger Eyes" sits last because it's the only track where she carries the entire vocal load solo, without a group arrangement to lean on.

The 3 Techniques Behind Sujeong's Sound

Deliberate Nasal Resonance as a Signature Identifier

Sujeong's most recognizable trait is a thin, dreamlike tone produced by partially opening the soft palate and routing more airflow through the nasal cavity than a typical full oral-resonance pop vocal. The common mistake is assuming this is simply "a nasal voice" rather than a controllable resonance choice — singers who try to imitate it by singing with a stuffy or pinched tone end up sounding congested instead of airy. The actual skill is dialing nasal resonance up or down deliberately, the same way a singer adjusts vowel shape. In Bloom Vocal, the nasal resonance control, oral resonance placement, and resonance blending exercises (G-4, E-3, E-9) train this coordination directly. The mixed voice practice guide covers the resonance-blending fundamentals this technique depends on.

Airy Onset and Breathy Sustain

Rather than starting notes with a firm glottal closure, Sujeong's phrasing often begins with an airy onset — the vocal folds don't fully close at the start of the note, letting a controlled amount of air escape through the tone. This produces the soft, indie-pop-leaning texture heard across her solo catalog. The common mistake is losing pitch stability while trying to sound breathy, because under-supported breath leaks cause the note to drift flat. Semi-occluded vocal tract exercises — straw phonation and lip trills — combined with breath support drills let a singer add breathiness without sacrificing pitch accuracy. Bloom Vocal's SOVT straw phonation, breath support foundation, and airflow control exercises (C-16, A-3, A-6) build this directly.

Singer-Songwriter Dynamic Shaping

Because Sujeong writes, composes, and arranges much of her own solo material, her phrasing reflects a songwriter's instinct for dynamic shape — swelling volume up and pulling it back within a single line to build a narrative arc, rather than singing at one flat intensity throughout. The common mistake is treating dynamics as an afterthought instead of a planned shape across the phrase. Practicing a swell-and-release on a single sustained note, then applying the same shape to a full lyric line, is how this control is built. Bloom Vocal's dynamic control, crescendo-decrescendo training, and phrase shaping exercises (F-1, F-2, D-5) target this skill set directly.

How to Train Toward Sujeong's Style

Step 1 — Confirm your comfortable range and a straight-tone baseline

Run a range test from your lowest to highest comfortable note and pick a key where a Lovelyz melody, like "Destiny," sits in your relaxed middle voice. A steady straight tone is the foundation Sujeong's airy coloring is built on top of, not a replacement for it.

Step 2 — Train controlled nasal resonance

Hum a phrase, then speak the same words, then sing them while paying attention to how much air passes through the nose versus the mouth. Practice increasing and decreasing that nasal ratio deliberately on the same phrase rather than settling on one fixed resonance.

Step 3 — Practice airy onsets without losing pitch control

Start a sustained note with a soft, unpressed onset that lets a small amount of air escape before full vocal fold closure, then check that the pitch stays centered instead of sagging flat. Straw phonation beforehand helps calibrate the right amount of airflow.

Step 4 — Build phrase-level dynamic shaping

Take a single lyric line and swell the volume up through the middle of the phrase, then pull it back down by the end, keeping tone quality consistent at both the quiet and loud extremes. This mirrors the dynamic storytelling in her self-written solo material.

Step 5 — Run an AI feedback loop on a single phrase

Choose one 4-to-8 bar phrase — ideally one with a dynamic swell or a passaggio lift, like the bridge of "Now, We" — record it, and use Bloom Vocal's AI coaching to score your pitch accuracy, breath support, and expression. The AI surfaces specific habits, like an airy onset drifting flat or an uneven dynamic swell, that are difficult to catch by self-listening alone.

Check Your Cover with AI

Ear-based imitation has a ceiling: you can't reliably hear your own onset losing pitch stability, a dynamic swell falling flat, or a passaggio transition tensing under pressure while you're performing it. Record a passage from Sujeong's repertoire — the bridge lift in "Now, We" or a full verse of "Tiger Eyes" — and Bloom Vocal's AI scores your pitch accuracy, breath support, register transitions, rhythm, and expression on a 1–5 rubric, then recommends the specific exercises to address your weakest area first. It turns "that felt a bit flat" into "your A4→C5 transition lost breath support — drill mixed voice and passaggio control exercises."

For more on how to sing like other Korean vocalists with a similar lighter, airier tone, see Baek Yerin, Heize, Lee Hi, and Yuju (GFRIEND).

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References

• Sadolin, C. (2000). Complete Vocal Technique. Shout Publishing. [Vocal mode classifications and resonance strategies, including nasal resonance and breathy/airy vocal modes used in pop and indie styles.]
• Titze, I. R., & Verdolini Abbott, K. (2012). Vocology: The Science and Practice of Voice Habilitation. National Center for Voice and Speech. [Breath support and airflow management underlying controlled airy onsets and stable dynamic-range shifts.]