Why Descendants of the Sun is entitled Descendants of the Sun?

Many have been curious about the title of the South Korean television series Descendants of the Sun.
Are you curious about it too?
You may ask questions like, what is the connection of the "sun" there?
Why are they called descendants?
Let us answer but first let us talked what is it in order to know the answer.

The Korean television series, Descendants of the Sun was aired KBS2 from February 24 to April 14, 2016 and in the Philippines, it is airing in GMA Network and is now one of theost talked Koreanovela  on the country.
The main casts of the television series are Yoo Shi Jin and Kang Mo-Yeon

Song Joong-Ki as Yoo Shi Jin

He is the cutest and most handsome soldier I've ever seen. He is courageous yet funny in his ways. What intrigues me is that he got a lot of secrets on him self that made him known as a Mysterious Soldier.

Song Hye-Kyo as Kang Mo-Yeon

She is the intelligent doctor who was assigned in the camp of the soldier. She is such beautiful and caring doctor. That's why many soldiers are attracted to her beauty as well as her personality.

During the interview with the writers, they said that Song Jong Ki  was not really planned as the main cast. It was just happened that nobody wants the role because many expressed their discomfort with the role as a "soldier". The writer never expect it to be a successful drama.

The writer was asked then about the reason why the television series was named as "Descendants of the Sun".

The writer replied,
"Just as how the sun gives light to other people, we decided on the title because the selfless personalities of the main characters is a source of warmth for the people around them."

Another thing, before they conceptualize the television series, they were thinking of a title that can make someone else curious by just knowing the title.
Have you been curious with the title too? It's because it was planned to make you curious. Bright idea from the authors.

In addition to that there was also a comment taken from the writers answer which is also reasonable for title.
One of the comments says that,
"The author refers to our promises and swears. They should prevail under any sun in this earth. No matter where you are you should keep your words and promises like the sun is watching you.'

So now there you go, you now know the answer. Congratulations!
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God bless. Pray always. :)