The July 10 broadcast of Channel A’s “Heard It Through the Grapevine” discussed the two actors’ upcoming marriage.
Another panelist then added, “Many actors, such as Jo In Sung, Kim Woo Bin, Lee Min Ho, and Kang Dong Won, were in talks for the role of Yoo Si Jin in ‘Descendants of the Sun.’ However, most of them had to turn it down because the drama was being pre-produced and filmed overseas. Jo In Sung then recommended Song Joong Ki to the production staff.”
It looks like Jo In Sung played a pretty significant role in this whole thing! Meanwhile, you can read more of Song Joong Ki and Song Hye Kyo’s love story here.