Just 5kg for one day...Yun Siyoon, is this possible? Body fat percentage is 3%. Bad diet.

By Jieun, Baek

Jun 23, 2025

Just 5kg for one day...Yun Siyoon, is this possible? Body fat percentage is 3%. Bad diet.



Actor Yoon Si-yoon succeeded in losing 5kg in a day.

On SBS 'My Ugly Baby', which aired on the 22nd, Yoon Si-yoon was depicted going on an extreme diet for the drama 'Model Taxi 3'.

Yoon Si-yoon was 1m77cm tall, weighed 67kg, and maintained a skinny body shape with a body fat percentage of 6.7%. However, he went on a 24-hour single diet to film 'Exemplary Taxi 3'.




He set a 24-hour water alarm and ate anhydrous meal consisting of tofu dumplings and asparagus. When I couldn't hold back my thirst, I rinsed my mouth with water and spat it out. In the middle of this, he did high-intensity training and even a high-temperature and humid sauna to completely dehydrate, losing moisture in his body.

Just 5kg for one day...Yun Siyoon, is this possible? Body fat percentage is 3%. Bad diet.
Yoon Si-yoon was distressed by immersing himself in a 45-degree hot water bath, and even shed tears at the pain of not drinking water. Nevertheless, he comforted himself by saying, "It's okay. We all live like that." He even cleaned the bathroom floor, toilet, and bathtub. Even Seo Jang-hoon, famous for being a neat giant, was surprised, saying, "He's really terrible."

As a result, Yoon Si-yoon, who weighed 67 kilograms in the morning, lost up to 62.3 kilograms in nine hours. The body fat percentage decreased from 6.7% to 3.6%.




Yun Si-yoon visits the photo studio and says, "I want to test if I'm on camera the way I want to be. "I want to give you a sharp, alive look with my eyes, something I've never shown before."

Shin Dong-yeop threw his tongue at Yoon Si-yoon's appearance, saying "Professional itself"





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