Actor Seo Kang-joon displayed the visuals of a classic handsome man.

On the afternoon of the 26th, a photo was posted on the official social media of Seo Kang-joon's agency, Man of Creation, along with the caption, "I found it... a photo to put behind my phone case."

The published photo was a certificate photo of Seo Kang-joon. Wearing a school uniform, Seo Kang-joon boasts perfect proportions and stunning beauty with an upright posture. With a slight smile, Seo Kang-joon particularly concentrated attention with his captivating gaze. At 31 years old, the impressive fit of the school uniform is unbelievable, and Seo Kang-joon set a new standard for classic handsome men.

Seo Kang-joon made his comeback with the MBC drama "Undercover High School," which premiered on the 21st. In the drama, Seo Kang-joon plays Jung Hae-sung, a National Intelligence Service agent who disguises himself as a high school student, foreseeing a wave of popularity.

With the premiere of "Undercover High School," Seo Kang-joon showcased unparalleled popularity by ranking first in the TV-OTT drama institutional sector topic of cast appearance.

[Photo] Provided by Man of Creation.

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