What is Song Joong Ki like behind the scenes of 'Descendant of the Sun'?

Captain Yoo or Song Joong Ki is said to be perfect both on and off screen.
 

In behind-the-scenes cuts of 'Descendant of the Sun', Song Joong Ki is spotted working hard and still looking gorgeous off camera. He also looks serious and focused on the set as he prepares for the shoot. 

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A drama staff complimented Song Joong Ki, saying, "Song Joong Ki is a 'perfect actor' both on and off camera. It's amazing how he automatically dives into his character when the cameras turn on. He is also extremely caring of the drama staff and other actors off screen."

He continued, "Song Joong Ki steals hearts of many viewers on the screen, but steals hearts of the staff on the drama set. The work environment was joyful due to Song Joong Ki, and I came to understand why this guy is so loved by many people."

Are you surprised?