Sui

Sui was born Lee Subin (이수빈) on April 10, 2006, in Seoul, South Korea. She debuted as KiiiKiii's Main Vocalist, quickly earning recognition for her stable vocals and bright tone. Source: KProfiles

Sui is tied with Kya as the tallest member of KiiiKiii. The two members share the distinction, creating a fun contrast with leader Jiyu, who is the group's shortest member. Source: NamuWiki

Unlike most of her fellow members, whose voices naturally lean toward a huskier tone, Sui is known for having a clear, clean vocal color. This unique contrast helps add balance and variety to KiiiKiii's overall sound. Source: NamuWiki

Before joining Starship Entertainment, Sui was accepted into SM Entertainment through MuDoctor Academy in 2022. Her acceptance into one of Korea's biggest entertainment companies highlighted her talent long before debut. Source: NamuWiki

In August 2023, Sui officially joined Starship Entertainment as a trainee. After intensive training, she earned a place in KiiiKiii's debut lineup. Source: NamuWiki

When Starship executives first reviewed her audition tape, they believed Sui's visuals and presence made her an ideal actress. She came close to signing with King Kong by Starship, the company's acting agency, before deciding to continue pursuing her dream of becoming an idol instead. Source: NamuWiki

Sui impressed fans with a beautiful high-note ad-lib in the "I Do Me (Acoustic Ver.)" performance released through 1theK Original. Many listeners praised the note because it stood out much more clearly than it had in the original studio recording. Source: NamuWiki

On May 25, 2025, Sui threw the ceremonial first pitch for the SSG Landers. The appearance was part of a unique promotional event in which all five KiiiKiii members threw first pitches at different baseball stadiums on the same day. Source: NamuWiki

Sui's favorite comfort food is galbitang (short rib soup). She recommends it so often that fans affectionately nicknamed her "Bitangi," a playful reference to her love for the dish. Source: NamuWiki

Sui has shared that joining KiiiKiii changed her personality in many positive ways. She explained that she used to be shy and hesitant about trying new experiences, but debuting with the group helped her become much more confident. Source: NamuWiki

On April 12, 2025, Sui served as a special MC for Show! Music Core alongside fellow KiiiKiii member Leesol and Hearts2Hearts' A-na. The opportunity showcased her growing confidence beyond performing on stage. Source: KProfiles

Fans have frequently commented that Sui resembles actress Yang Hye Ji and Red Velvet's Wendy. Her soft features and warm smile have become some of her most recognizable visual charms. Source: KProfiles

Sui once had her MBTI listed as ENTP, but she later confirmed through a Bubble message on March 17, 2026, that it had been updated. Fans appreciated her personally clarifying the information herself. Source: NamuWiki

Although she nearly began her entertainment career as an actress, Sui ultimately chose music because performing as an idol matched her dreams more closely. Fans often point to that decision as one of the reasons KiiiKiii gained such a strong main vocalist. Source: NamuWiki

Her vocal tone has become one of KiiiKiii's defining strengths. While other members often provide rich, husky textures, Sui's brighter sound gives the group's songs added clarity and emotional contrast. Source: NamuWiki

Fellow fans admire Sui not only for her singing ability but also for her steady personal growth. Watching her transform from someone who described herself as timid into a confident performer has made many supporters feel deeply connected to her journey. Source: NamuWiki

From nearly debuting as an actress to becoming KiiiKiii's main vocalist, Sui's story demonstrates how trusting your own dreams can lead to unexpected success. Her willingness to follow the path that felt right has become one of the most inspiring parts of her career. Source: NamuWiki

Even early in her career, Sui has earned a reputation as one of the most promising young vocalists among fifth-generation K-pop idols. Her combination of technical skill, emotional expression, and genuine personality suggests an exciting future ahead. Source: KProfiles, NamuWiki