Song Joong-ki
On November 25, 2015, it was announced that actor Song Joong-ki injured his arm while filming an action scene for the drama on November 23. On December 7, 2015, Song Joong-ki returned to work only 2 weeks after he was injured and spotted filming at a station in Seoul. The MERS-CoV outbreak in South Korea in 2015 also seriously hampered filming schedules. The outbreak claimed the lives of 33 people, according to WHO.