Back in his young adult days, Hyun-sik is a passionate musician who is eager to try new music. He has his eyes on Jae-ha’s gifted musical talent and asks him to join his band called ‘Spring Summer Autumn Winter’. Together, they open a new era by establishing the culture of live-music concert and get a big fame.

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In an alternate version of the present, Tokyo has been decimated by a shocking terrorist attack, and the only hint to the identity of the culprit is a bizarre video uploaded to the internet. The police, baffled by this cryptic clue, are powerless to stop the paranoia spreading across the population. While the world searches for a criminal mastermind to blame for this tragedy, two mysterious children - children who shouldn't even exist - masterfully carry out their heinous plan. Cursed to walk through this world with the names Nine and Twelve, the two combine to form "Sphinx," a clandestine entity determine to wake the people from their slumber - and pull the trigger on this world.