The entire thing feels like just an interlude, if not an OC-filled fanfiction of the prosecutor series. I mean, I liked all the individual investigating stories and the interactions with vampire-lady, and I loved Lee Joon and all the "good guys" cast and characters. But I was utterly indifferent to the main story. YuJin/San never appealed much to me --he had more chemistry with the mob-heir police officer lady tbh-- and TaeJun was a horrible character with horribly written issues. Overall, we are left with too many questions and plot holes, especially in combination with Vampire Prosecutor 1 & 2. Especially San's vampirism was barely discussed or noted. Which just feels like cheating, considering the series' title.