C.I.A; What comes to your mind when someone mentions this 3 letter acronym? In this world there are two C.I.As.

Of course, there's the Central Intelligence Agency. Well known from cracking some of the hardest cases in the world.

But what we don't know is that someone has been doing their dirty work for them. Meet the other C.I.A, Cube Investigations Association. They are the one who crack the cases that the C.I.A can't solve. They are the one who hunt down the criminals who the C.I.A can't catch. When the Central Intelligence Agency is unable to solve a case or serial killing in Korea, they request the help of Cube Investigations Association. 

And when 6 of their best men die, they know it's time to call in the best of the best.