Neuro Seoul, 10:30pm, 25th February 2205: 

"Between us, only one will be chosen to walk through the temple of time! hurry, before they find us out-"

"But Channie, I wanna go with you-"

"Don't worry Sehun-ah, I'll be by your side, forever~"

"But I don't want you to be one of the army..."

"Shhh... don't worry, I won't.. okay?"

Sehun, the son of Neuro Seoul's President and Chanyeol, the one and only son of the mayor were in rush to run from the city because of the Soul's Bureau. [Every 20 years, Soul's Bureau will find the new soul to be hired as Aristocrat Army in EXO'Aqua. Most of the army were soulless and their memories will be erased, nothing's left inside their brain. Their bodies were replaced by the Aquageo liquid which was conquering their bodies to be heartless, mindless, and they'll be the world's cruel army, they don't know love, family, and friends. They know nothing except their country and aristocrat of EXO'Aqua. There's nothing can stop them, except death.]

One and only chance to run away from the Soul's Bureau is walk through the Temple Of Time. But only one of them will be chosen, it's depend to their date of birth. If in the future or the past was undergoing your date of birth, then you'll be the one who will walk through the temple of time. 

Seoul, 7:00am, 12th April 2014:

"WHAT THE HELL ARE YOU DOING IN MY HOUSE?!"

"Channie! We did it!! We did it together!!"

"What the hell are you trying to say? I'm not Channie, I'm Chanyeol, PARK CHANYEOL! And what did we freaking do together?!"

"Walking through the temple of time! I knew you're Chanyeol, and of cour-"

"You even know ma name? Oh God!! WHAT A STALKER! GET OUT FROM MY HOUSE!!"

"B- B- But Chan---"

BAM!!! Chanyeol slams the door shut. I'm your Sehun, Channie... Is that another you? No! It's you isn't it?

CHAJAN!!!! NEW IDEA~~~ KEKEKE