Just the other day, KBS graced fans with behind cuts of the handsome Yoo Ah In during his cameo appearance on 'Descendants of the Sun'!

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The pictures show the handsome actor completely absorbing the role of a suave bank teller opposite Song Hye Kyo, who becomes the object of his affections much to the jealousy of Song Joong Ki.  You can see him working hard at it, reading the script, but he keeps the atmosphere warm and fuzzy with his bright smile.

The netizens fell in love with the behind cuts, leaving comments such as, "Yoo Ah In wasn't the cameo but the main," "They filmed in such a warm mood like that; just seeing that makes my heart flutter," "I wish Yoo Ah In would come out in 'Descendants of the Sun' again," and more.