Song Joong Ki has chosen his comeback drama. For his first role after completing his two-year mandatory military service, he will play the leader of a peacekeeping unit in an area endangered by military conflict. He has taken the role of Yoo Si Jin in the upcoming drama "Descendants of the Sun."

His co-star in that drama will be film and drama actress Song Hye Kyo. Song Hye Kyo will play Kang Mo Yeon, a doctor who works with the international charity organization Doctors Without Borders. The two characters will not hit it off from the start but working together in dangerous situations helps to bring them closer and eventually leads them to fall in love.

Falling in love is an experience that is often all the more intense when it happens in a hostile environment.

Song Joong Ki's military duties end on May 26. And due to his pre-enlistment success the 29-year-old actor received many offers while still serving his military duty. His last drama role, before heading to the army in August 2013, was playing Kang Maru in "Nice Guy," also known as "The Innocent Man." He was praised for his work in the film "A Werewolf Boy."

"Descendants of the Sun " will also be a drama comeback for Song Hye Kyo. Her last small screen appearance was playing Oh Young, a blind heiress conned by Jo In Sung in the 2013 melodrama "That Winter The Wind Blows." She has appeared in several films since then. The 33-year-old actress had roles in the 2013 film "The Grandmaster" and the 2014 films "My Brilliant Life" and "The Crossing: Part 1." In 2015 she can be seen in "The Crossing: Part 2" and "The Queens."

Also cast in the drama are actor Jin Goo and actress Kim Ji Won. Jin Goo, who appeared in the film "The Battle for Yeonpyeong" and the drama "Ad Genius Lee Tae Baek" will play Officer Seo Dae Yeong.Kim Ji Won, who appeared in the dramas "The Heirs" and "Gap Dong," will play a surgeon.

Most of "Descendants of the Sun" will be filmed in foreign locations and the drama will be mostly produced before it begins airing in the latter half of 2015.

Song Joong Ki and Song Hye Kyo were probably attracted to the drama because of its successful head writer. Kim Eun Sook, who wrote the screenplays for "The Heirs," "A Gentleman's Dignity" and "Secret Garden," is writing the screenplay for "Descendants of the Sun." She will work on the screenplay with Kim Son Suk, who worked on "The Queen's Classroom."

The drama will be produced by Baruson Entertainment, which produced the films "The Good, The Bad and The Weird," "Mother" and "The Servant."