Yoo Si-jin to pull on Kang Mo-yeon's heartstrings in 'Descendants of the Sun'

SEOUL, March 11 (Yonhap) -- Yoo Si-jin, played by Song Joong-ki, will continue to tug at Kang Mo-yeon's heartstrings in "Descendants of the Sun" next week, as contact between the couple is cut off during a post-earthquake rescue operation. In the m