Actor Yoon Si Yoon's Shocking Transformation

Yoon Si Yoon left audiences astounded with his dramatic weight loss reveal on the June 22, 2025 episode of SBS’s 'My Ugly Duckling.' The actor disclosed that he managed to lose an astonishing 5kg in just one day, all through a grueling no-water diet!

Preparing for Taxi Driver 3: The Dedication Behind the Transformation

As he gears up for his role in 'Taxi Driver 3,' Yoon expressed a desire to completely reinvent his on-screen persona. "I want to show a new texture to my character—something sharp and hollow, like I’m completely worn down," he explained, emphasizing his dedication to the role.

Surviving a Day Without Water

To achieve this extreme transformation, Yoon committed to a 24-hour period without any liquids, pushing his body to the brink. When he started, he weighed in at 67.4kg (148.6 lbs) with a body fat percentage of 6.7%. He crafted a strict, zero-moisture meal plan consisting solely of dried tofu and asparagus, famous for their diuretic properties.

The Astonishing Results

After a full day of this intense regimen, Yoon stepped on the scale and shocked everyone: he weighed just 62.3kg (137.3 lbs), with a dramatically reduced body fat percentage of 3.6%! But he didn’t stop there; three days before his photoshoot, he ramped up his workouts, sweating profusely to shed even more weight.

Extreme Methods for Extreme Roles

In a final push, Yoon pushed his limits further by spending time in a blistering 45°C sauna, reminiscent of UFC fighters, soaking for 20 minutes to sweat out every last drop of water weight. The results? Nothing short of astounding!

Fans and Fellow Actors Marvel at His Commitment

While his methods raised eyebrows and sparked concern among some, Yoon Si Yoon's dedication has captivated fans and co-stars alike. His incredible transformation stands as a testament to his commitment to his craft, showcasing how far he's willing to go to bring his characters to life.

A Star Willing to Risk It All!

Yoon Si Yoon's transformation is a striking reminder of the lengths some actors will go to for their art. Will this level of dedication inspire others in the industry? Only time will tell!