A historical drama that deals with the second and third periods of the Goryeo-Khitan War. King Hyeonjong of Goryeo and his political teacher, Commander-in-Chief Gang Gam Chan, unite the people of Goryeo and lead a war against Khitan. (Source: HanCinema, AsianWiki, NamuWiki) Adapted from the novel "Goryeo-Khitan War: Sweet Rain in The Winter" (고려거란전기: 겨울에 내리는 단비) by Gil Seung Soo (길승수).