You know what guys?
I forgot to tell you the original plot for this story. You all probably don't care but here it is anyway:

So the spy was going to be Namjoon, because Melantha offered him a deal that if he provided her with knowledge and helped her develop the serums then she would leave BTS alone and not harm them. Yoongi got kidnapped and although Namjoon would have acted scared but he would have known where he was, thinking that Mel wouldn't actually hurt him.

But obviously she doesn't pay heed to her end of the deal, and attacks back when BTS and the idols attack. Namjoon would be revealed as the spy and they'd all be shocked and betrayed. But then they demand for Yoongi and so Mel laughs and brings Yoongi, who she's turned into one of her monsters, and everyone including Namjoon is devastated - Namjoon pleads with BTS that he only helped Mel to protect his group and so they sort of forgive him and they all battle against Mel.

Unfortunately Yoongi cannot be saved and is killed by Hoseok when he was about hit Jimin, which hurts them deeply as they watch their fallen team member even though there was no other option.

Now for the final part - in the very end, just as Mel was about to strike at Yoona, Jimin sacrifices his life for her and steps in the way, so the fatal attack lands on him instead. Jungkook uses this as an opportunity to kill Melantha for murdering his hyung.

A week after, BTS are still mourning Jimin and Yoongi's death. They are greatly affected by it, of course. But, at the very end of the last chapter....

"Jimin would have wanted you to be strong; we need to admire his sacrifice, not cry," Jungkook murmured in Yoona's ear, soothingly rubbing her back with one hand, tucking her hair behind her ear with the other. Yoona nodded, unable to say anything.

Just then, the pair's heads whipped up at the sound of the front door being pushed open, and both their eyes widened in unison.

"Jimin?!"

Something like that.
So yeah! This was I was originally going to write until I had the brainwave of making Jungkook the spy, just for the drama.... Hehehe

Just thought I'd let you know of the original story line （＾ω＾）