Actress Koo Hye-sun acknowledged a rebound effect after dieting.

On the 18th Koo Hye-sun posted a short video along with the words "Himalaya 8kg bulk-up expedition" on her social account.

In the video Koo Hye-sun attended a Himalaya expedition that wished success to the Republic of Korea soccer team in the "2026 FIFA CONCACAF World Cup." Wearing a rainbow-colored hat and a thick outer jacket Koo Hye-sun, thinking it was a photo shoot, posed and then became bashful when she realized it was a video.

Soon Koo Hye-sun made faces as if filming a challenge to match the mood. What draws attention is Koo Hye-sun's appearance. As if revealing the hardships of the Himalaya expedition she appeared puffy-faced and seemed to have gained weight. Koo Hye-sun, who had boasted peak beauty from dieting, returned from the Himalaya having experienced a rebound.

Koo Hye-sun introduced it as "a video shot at an altitude of 4,300m" and raised interest in an entertainment program where she will share her story.

Meanwhile Koo Hye-sun has been active as a businessperson, recently placing hair rollers she developed in duty-free shops.

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