[BTS & Apink] I Fell Inlove With a Spy

I Fell Inlove With a Spy is a fanfiction story between Bangtan Boys (BTS) and Apink with V a.k.a. Taehyung and Eunji as the main characters. They started to know each other when they became classmates in an elite school and there they became close and fell inlove with each other.
The question here now is that who among the two of them is the spy? Taehyung? Eunji? Both of them? Or none of them? You'll find out the answer in the story ;)