The reason Seo In-young's 46kg bodysuit performance became a hot topic is not simply because of the number on the scale. On August 22, 2026, at Waterbomb Sokcho, she presented an intense performance featuring blonde short hair and a white bodysuit, drawing attention not only to her preparation process but also to her stage presence.
The key elements of this performance were the styling perfected after losing about 4kg over a month, a diet centered on eggs and protein, and high-intensity practice with the dance team Hook. Let's summarize, in order, what outfits Seo In-young wore, what she prepared, and which scenes from the actual performance drew a reaction from the audience.
The key to Seo In-young's 46kg bodysuit stage was the white styling.
Seo In-young took the stage at Waterbomb Sokcho, held at Hanwha Resort Seorak Sorano in Sokcho, Gangwon-do, on August 22, 2026. The performance was Seo In-young's First Waterbomb appearanceShe was introduced as such, and her look combining a blonde short haircut, a white bodysuit, and white long boots caught the eye.
The bodysuit is adorned with beads and glitter, and features fringe details along the hip line. With the addition of a deeply cut back design, it is finished as a stage costume that emphasizes the body's silhouette and performance more than typical sporty Waterbomb outfits.
What caught the audience's attention more than the number 46kg was the strong silhouette of the white bodysuit and Seo In-young's unique stage charisma.
The image transformation created by the white bodysuit and blonde short haircut
This styling resembles the strong image Seo In-young showed during her time with Jewelry. However, instead of long hair, she chose a bright blonde short cut, and combined strong makeup with a bold bodysuit to create a new look suitable for the 2026 stage.
The white color was also chosen to clearly showcase the costume details at the water-based Waterbomb venue. Glitter and beads enhanced movement under the lights, while the fringes along the hip line swayed in sync with the choreography, adding to the rhythm of the performance.
| division | Stage style | Notable features |
|---|---|---|
| Hair | Bright blonde short hair | A strong impression breaking away from the long-haired image |
| garb | white bodysuit | Beads, glitter, deep cut back |
| boots | White long boots | Stage silhouette with unified costume colors |
| decoration | Pelvic line fringe | Performance elements that emphasize movement |
While intense expressions and charisma stood out on stage, a playful and relaxed atmosphere was also conveyed in the behind-the-scenes footage with the dancers. It is impressive that teamwork and tension coexisted behind the dazzling final product.
Losing 46kg was part of the stage preparation I carried out for a month.
It was reported that Seo In-young lost about 4kg in a month leading up to the Waterbomb stage, bringing her final weight to 46kg. However, since her height and weight before weight loss were not disclosed together, this number should not be taken as a standard for general body types or health goals.
The diet consisted mainly of eggs and protein, and it was also reported that the individual felt dizzy during the management process. A strict diet centered on eggs and proteinAs this method originated from specific situations involving the preparation of a performance, it cannot be viewed as a diet that the general public can follow exactly.
The preparation process also included details that arm liposuction and laser treatments were performed in combination. Since procedures are medical processes separate from dieting, it is more appropriate to view them as distinct preparation items rather than simply grouping them together like weight loss methods.
We enhanced the quality of the performance through choreography and practicing 13 songs consecutively.
The stage was not completed solely through appearance management. Seo In-young choreographed with Hook, the dance team led by Aiki, and during the performance preparation process Practice 13 songs in a rowWhile doing so, I even checked my physical condition and movement path.
The statement that 13 songs were practiced consecutively means that they were practiced continuously during the preparation process, not that all 13 songs were actually sung on stage. On the revealed stage, the representative songs 'Cinderella' and 'Thank You' were introduced, and through these two songs, Seo In-young showcased her familiar musical style.
In particular, Waterbomb is an event where both the audience and the singers move while wet, so the movement patterns differ from those of typical indoor stages. It appears that the comfort of the bodysuits and long boots, the distance from the dance team, and the process of coordinating live timing were crucial, and these performance elements were central to this preparation as well.
Post-performance scene where eyes welled up with tears at the audience's cheers
Seo In-young delivered powerful performances during the stages of 'Cinderella' and 'Thank You'. While her white outfit and blonde hair generated visual buzz, it was also noted that the key to drawing the audience's reaction was her live singing and stage presence.
It was also reported that as the audience's cheers grew louder during the performance, Seo In-young teared up and was unable to continue singing for a moment. It was seen as a moment when a singer who has been active on stage for a long time directly shared her emotions with the audience during her first Waterbomb performance.
For Seo In-young's Waterbomb Sokcho performance, the process of preparing the costumes, choreography, and live performance together to stand on stage again was a bigger story than the weight loss itself.
‘The preparation process revealed in 'Seo In-young's Reformation'
My pre-stage diet and choreography practice process is on my YouTube channel ‘Seo In-young, who has turned over a new leaf’It was introduced through [the content]'s behind-the-scenes content. Scenes ranging from diet management to practicing with the dance team Hook, and the process of building up stamina ahead of the performance were mentioned.
It was also reported that he invested his entire appearance fee into stage direction and costume preparation. Rather than focusing on the specific amount, the fact that he personally dedicated his efforts to the stage concept, costumes, and performance demonstrates the direction of his preparations for this show.
When watching the Waterbomb Sokcho stage, there is no need to focus solely on the number '46kg'. If you examine the image transformation with the blonde short haircut and white bodysuit, the choreography accompanied by the hook, and the live performances of 'Cinderella' and 'Thank You' together, the reason why the stage became a hot topic becomes much clearer.