What 2017 television series did Jin Goo's co-star star in?
Descendants of the Sun: Descendants of the Sun () is a 2016 South Korean television series starring Song Joong-ki, Song Hye-kyo, Jin Goo, and Kim Ji-won. Kim Ji-won (actress):  She gained attention through her roles in television series "The Heirs" (2013), "Descendants of the Sun" (2016) and "Fight for My Way" (2017).
"Fight for My Way"