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Directed by Kim Eui-seok, Cheongpung myeongweol (Sword in the Moon) is set in 17th century Korea, a chaotic time period in which the once Confucian society was threatened by an attempted Japanese invasion. The film is centered around an elite band of imperial guards hired to protect the old ways. Choi Ji-hwan (Choi Min-su) and Yun Gyu-yeob (Jo Jae-hyeon) make the backbone of the group, but unforeseen circumstances cause Yun to turn on Choi, the latter of which disappears from the scene after having been revealed as responsible for several murders. Yun's search results in apprehending swordswoman Shi-yeong (Kim Bo-gyeong), Choi's lover and partner in crime, who Yun tortures for information on Choi's whereabouts. Eventually, Choi and Yun meet and prepare for a final battle. The film also features Lee Jong-su, Jeon Seong-hwan, Gi Ju-bong, Yu Yeon-su, and Kang Shin-il.