around the time of late joseon dynasty (1392-1910) when hierarchy between nobles and slaves started to fall apart and riots were common among peasants, two men were born on the same day and at the same time. chun dung who grew up in a beggar's quarters (although born as a noble) with no knowledge of his parents, dreams of "making this world a better place" by taking part in the peasants’ riot while gwi dong who was raised in a noble life (though he was born as a beggar), serves as a police official, fights against corruption within the government and speaks for the weak. although both give their hearts to the same woman, they become the greatest duo ever in order to reform the problematic world.