Yoo Si - jin (Song Joong - ki) is the captain of a South Korean Special Forces unit. He and his friend Sergeant Major Seo Dae - young (Jin Goo) are off - duty when they witness a young man, Kim Ki - bum (Kim Min - seok), steal a motorcycle and apprehend him. The thief is injured during his capture and therefore sent to the hospital. Dae - young realizes his cell phone was stolen by the thief and goes to the hospital along with Si - jin to retrieve his cellphone.
song joong ki name in descendants of the sun
Yoo Si - jin