In 2029, an elite police squad combats an anti-reunification terrorist group while another enemy lurks nearby.

Set in the late 1920s, The Age of Shadows follows the cat-and-mouse game that unfolds between a group of resistance fighters trying to bring in explosives from Shanghai to destroy key Japanese facilities in Seoul, and Japanese agents trying to stop them.

As a B grade erotic theater group is about to close down, affected by the economic recession, they decide to perform a proper theater play for their last show as they have always been dreaming of. Their choice of play is the classic theater play, 'Hamlet'. However, once the theater play has started running, their performance goes to an unexpected direction due to the mistakes and adlib they never thought were going to happen on the stage. Will their curtain call occur happily as they hoped in the beginning?

Hong Gil-dong is an infallible private detective with an exceptional memory and quirky personality. While chasing the only target he failed to find, he gets entangled in a much bigger conspiracy than he bargained for.