My enemy/lover is a VAMPIRE!!! Book 1

Serah Avilla is an average student, that's what the others thought, but behind the loner personality that she shows there's more to it. Serah works for the DC corporation for 5 years now as a SPY, her BOSS ordered her to spy someone named David Sinclaire, Serah thought that he's just an ordinary person, so she wanted to finish her mission as soon as possible cause for her, he's just a waste of time, that's what she thoughts...