good and bad

Vampires are hidden everywhere. The only thing that can distinguish them is their eyes and their craving for blood. The good vampires' eyes are purple and don't crave blood often whereas the bad vampires' eyes are red and crave blood most of the time especially if they're really hungry. 

What if one of the bad vampires have fallen for one of the good vampires' beloved soulmate? Will the good vampire protect what is truly hers/his or will s/he surrender?

author's note

T I  didn't specificly say who is going to be the good or bad even though the gifs are Seolhyun and Hyuna. And I know that Seolhyun's gif is kinda... so, if you guys find any gifs from Orange Marmalade and her eyes turned purple, please give me the link by PM. Comment if you guys want it!