Premise: The Age of Shadows (; lit. "Emissary") is a 2016 South Korean period action thriller film directed by Kim Jee-woon and written by Lee Ji-min and Park Jong-dae. The film stars Song Kang-ho and Gong Yoo. It was selected as the South Korean entry for the Best Foreign Language Film at the 89th Academy Awards but it was not nominated.
Hypothesis: The Age of Shadows was inspired by ancient Korean lore