Actor Gu Hye-sun boasted a beauty that defies aging.

On the 13th, Gu Hye-sun posted on her social account "I am defending my master's thesis. Victory!" along with a photo.

In the released photo, Gu Hye-sun is preparing her master's thesis. Gu Hye-sun showed a twin-tail hairstyle with long, voluminous hair tied high into two braids. Maximizing an active and cute high-teen vibe, Gu Hye-sun emphasized a youthful image by styling her full bangs to make her face look smaller.

Even while preparing her master's thesis, Gu Hye-sun did not lose her beauty. Matching a white shirt with a navy-colored tie and showing exceptional fashion sense, Gu Hye-sun proved her reputation as an "ulzzang" with bright and lively makeup.

Meanwhile, Gu Hye-sun recently launched a foldable hair roller that she patented.

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