Earlier today, top stars Song Joong Ki and Song Hye Kyo announced that they will be getting married in October.
On July 5, a close acquaintance of the two actors revealed, They started having feelings for each other before Descendants of the Sun had aired. The drama was pre-produced so they actually began filming in the second half of 2015. I think that was when it all started.
Then early last year, Song Joong Ki secretly brought over some snacks to the set of Song Hye Kyos photo shoot. It was before their drama began airing so the staff wondered why he came, the acquaintance added.