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Two North Korean soldiers are killed in the border area between North and South Korea, prompting an investigation by a neutral body. The lead investigator (Lee Young-ae) receives differing accounts from the two sides.

In 1375, China was in chaos between Yuan Dynasty and Ming Dynasty. Coryo (an ancient kingdom of Korea then) sent a delegation of many diplomats, soldiers and a silent slave to make peace with the new Chinese government. However, this delegation got charged as spies and sent in exile to a remote desert.