Song Joong Ki and Song Hye Kyo shared some of their secrets to flawless skin during the press conference for 'Descendants of the Sun' which was held at Seoul's Imperial Palace Hotel on February 22. 

When a reporter complimented him, "Your skin is great even if you've been to the army," Song Joong Ki joked, "Soldiers are the one who are most diligent in skin care. We use at least three to four products." But of course, your skin must be 'on fleek' as you protect and serve your country! 

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Song Joong Ki gave a more serious answer, saying, "When I contract with a cosmetics brand, I usually use their products. I alway wear sunscreen and use facial masks every day." 

On the other hand, Song Hye Kyo said, "When I'm not working, I got to the dermatologist and get skin care treatments. I can't go when I'm filming so I carry around facial masks and always apply them before going to sleep." 

Whatever the stars do must be working because they look great!