Sung Hanbin, the leader of the globally recognized K-pop group ZEROBASEONE, has recently sparked significant conversation across social media and entertainment news outlets following a candid revelation regarding his physical transformation. During a recent guest appearance on the popular JTBC variety program Knowing Bros (also known as Ask Us Anything), the idol shared the unconventional details of a weight loss journey that saw him shed approximately 30 kilograms (66 pounds). This revelation has offered fans and the general public a rare glimpse into the personal discipline and unique strategies employed by artists before they reach the spotlight of the global stage.
The Revelation on Knowing Bros
The episode, which aired on May 2, 2026, featured the members of ZEROBASEONE engaging in the show’s signature classroom-style banter. While the program is known for its humor and lighthearted segments, the atmosphere turned reflective when the topic of pre-debut transformations arose. Sung Hanbin, who is frequently lauded by the Korean media for his "sculpted" visuals and "perfect" proportions, surprised the cast by admitting that his current physique was the result of intense effort and a specific, creative methodology.
Hanbin disclosed that during his middle and high school years, he reached a peak weight of approximately 100 kilograms (220 pounds). For a teenager, this weight presented various challenges, particularly as he began to harbor aspirations of entering the highly competitive performing arts industry. He described himself as having been "quite chubby" during his growth period, a stark contrast to the lean, 64-kilogram (141-pound) frame he maintains today.
The "Perfume Diet": A Creative Approach to Satiety
The most striking aspect of Hanbin’s testimony was his mention of what he termed the "perfume diet." In an industry where extreme caloric restriction and grueling workout regimens are often the standard, Hanbin’s reliance on olfactory stimulation stood out as a novel approach. He explained to the surprised cast members that he utilized fragrance as a tool to curb his appetite and manage cravings.
"I did what I call a ‘perfume diet,’" Hanbin stated during the broadcast. He elaborated that by applying specific scents or simply surrounding himself with the aroma of perfume, he found it easier to suppress the urge to overeat. According to Hanbin, the sensory input from the fragrance provided a psychological distraction from hunger, allowing him to maintain the caloric deficit necessary for such a drastic transformation.
While the "perfume diet" may sound anecdotal, psychological studies have often explored the link between scent and satiety. Aromatherapy and olfactory stimulation are known to influence the hypothalamus, the part of the brain responsible for regulating hunger signals. Scents such as peppermint, grapefruit, and even certain floral notes have been suggested in various wellness circles to help reduce cravings for sweets or heavy meals. Hanbin’s intuitive use of this method during his youth highlights a creative, self-taught approach to weight management.
Physical Consequences and Growth Stunting
Despite the success of his weight loss, Hanbin shared a poignant detail regarding the timing of his transformation. He noted that the rapid nature of his weight loss occurred during a critical phase of his physical development.
"I lost it rapidly during my growth period, and that’s when my height stopped growing," he remarked. Currently standing at 5’11” (181 cm), Hanbin is by no means short, yet his comment suggests that the physiological stress of a 30-kilogram weight loss during his mid-teens may have capped his ultimate height potential. This detail underscores the intensity of the "growth period" transformation and the trade-offs often made by those pursuing the stringent aesthetic standards of the idol industry.
Chronology of a Transformation: From Cheonan to the Global Stage
To understand the weight of Hanbin’s revelation, one must look at his trajectory leading up to his debut in ZEROBASEONE. Born in Cheonan, South Chungcheong Province, Hanbin’s journey was not a direct path to idol stardom. He spent years honing his skills as a dancer, specializing in genres such as waacking and tutting.
- Pre-Transformation (Middle School): Hanbin reached his peak weight of 100kg. During this time, he was a dedicated student with an interest in dance but had not yet undergone the physical shift required for the "idol look."
- The Transformation Period: During his late teens, Hanbin initiated his rigorous weight loss plan, utilizing the aforementioned "perfume diet" and increasing his physical activity through dance.
- The Backup Dancer Phase: Before appearing on reality television, Hanbin worked as a professional backup dancer. He notably performed behind established acts like BTS and Wanna One. During this period, he had already achieved a lean physique, though he was not yet a household name.
- Boys Planet (2023): Hanbin entered the Mnet survival show Boys Planet as a trainee from Studio GLIDE. From the first episode, he was noted for his "visual-center" qualities. He maintained the top spot in the rankings for nearly the entire duration of the show, eventually debuting as the center and leader of ZEROBASEONE.
- Present Day: As the leader of a "million-seller" rookie group, Hanbin’s physical maintenance is part of his professional routine. His current weight of 64kg is considered optimal for the high-energy choreography and demanding schedule of a top-tier K-pop artist.
Supporting Data and Industry Context
The K-pop industry is well-documented for its rigorous "visual" standards. According to data from various entertainment agencies, trainees are often expected to maintain a body mass index (BMI) that sits on the lower end of the healthy range to ensure they look "camera-ready." For a male idol of Hanbin’s height (181 cm), a weight of 64kg results in a BMI of approximately 19.5, which is within the healthy range but leans toward a slender profile.
Hanbin’s openness about his past weight is part of a growing trend among idols who are moving away from the "born perfect" narrative. By acknowledging his 100kg past, Hanbin humanizes the idol experience, showing that his current appearance is a result of labor and strategy rather than just genetics. This transparency has historically resonated well with fans, who appreciate the relatability of struggling with body image and health goals.
Official Responses and Fan Reactions
The reaction from the ZEROBASEONE fandom, known as ZE_ROSE, has been overwhelmingly supportive. Following the Knowing Bros broadcast, social media platforms were flooded with messages praising Hanbin’s dedication. Many fans noted that his story serves as an inspiration for those looking to make healthy changes in their own lives, though some expressed concern regarding the "rapid" nature of the weight loss he described.
Industry insiders have also commented on the "perfume diet" revelation. Wellness experts noted that while scent can be a helpful supplementary tool for appetite control, it is rarely sufficient as a standalone method. They speculate that Hanbin’s extensive dance training—which can burn upwards of 400 to 600 calories per hour—was likely the primary driver of his caloric expenditure, with the perfume acting as a psychological aid to manage the diet side of the equation.
Broader Impact and Implications
Sung Hanbin’s story contributes to the broader dialogue regarding the physical demands placed on K-pop performers. While his method was "creative," it highlights the immense pressure young trainees feel to transform their bodies in pursuit of their dreams.
Moreover, Hanbin’s success as the leader of ZEROBASEONE proves that his "past self" does not define his "current self." He has successfully transitioned from an aspiring dancer in Cheonan to a global icon, representing luxury brands and leading one of the most successful fifth-generation K-pop groups.
The "perfume diet" may become a quirky footnote in K-pop lore, but the discipline it represents is a testament to Hanbin’s character. As ZEROBASEONE continues to break records and expand their international reach, Hanbin’s journey from 100kg to the "nation’s center" remains a powerful narrative of self-reinvention and the relentless pursuit of excellence in the face of personal challenges.
In a world where the idol industry is often criticized for its superficiality, Sung Hanbin’s willingness to discuss the "unpolished" chapters of his life provides a layer of depth to his persona. It reinforces the idea that the "handsome idol" seen on screen is not just a product of styling and lighting, but an individual who navigated a difficult path of self-discipline to reach the pinnacle of his profession.
