Song Hye-kyo and Song Joong-ki, the on-screen couple of “Descendants of the Sun,” faces another crisis in their relationship, as Song Joong-ki is in a life-threatening condition following a gunshot injury.

In the latest episode that aired Wednesday, Dr. Kang Mo-yeon, played by Song Hye-kyo, and special forces Capt. Yoo Si-jin, played by Song Joong-ki, arrive back home in Seoul from Uruk, a fictional war-torn Mediterranean country. The two go on dates and enjoy spending time together for the first time in Seoul.

However, near the end of the episode, Yoo, who is in charge of security services during the high-level talks between North and South Korea, arrived at a hospital on an ambulance, lying on a gurney and soaked in blood.

Song Hye-kyo and Song Joong-ki (KBS2)

Yoo is unconscious. When Kang realizes her emergency patient is her boyfriend Yoo, she is shocked.

In teaser photos released by the broadcaster on Thursday, Kang tries to save Yoo.

In the past episodes, it was Yoo who rescued Kang from emergency situations. Viewers can find out whether Kang can save Yoo on Thursday’s 14th episode.

“Descendants of the Sun,” airs every Wednesday and Thursday at 10 p.m. on KBS2 channel.

By Ahn Sung-mi (sahn@heraldcorp.com)