Humans are fun to play but yet intelligent when  committing a crime: from greeting people with a smile to looking down on their own dead bodies.

South Korea has recently increase their killings for the past 3 years.

One kill then the other suicide finally a mass murder, it's like a game for them. Life is one but yet, someone one decided faith for them even on old elders to young infants that haven't open their eyes yet. 

But then again, for the past month or so, a pair of CSI ( crime scene investigators) has appear to stop the numbers from rising. More than 200 killers has been caught; some delusional to somewhat  who's normal in a human's eye. 

Choi Iris and Lee Sooyeon

Their names is the gossip in the police departments all over the country. 

No one knows where their Home Unit is at, they appear like a snap yet they have no educational background to be a where they are now. 

Is not common for their name to be appear unless a serial killer has appear and the whole town is shaken. 

Officers to Unit Chiefs has suspicious on their grand entry, not only two young beautiful woman has appear but something is off about them...

Can you figure it out before they do?