In a world where vampires exist, a special undercover agency keeps the rest of society safe by hunting them down. Agent “First” Shin is the best of the best. The only problem is he keeps losing partners, so he’s decided to stick to working solo. However, his manager has other plans, and a recruit is assigned to him. The new guy just won’t leave him alone, yet annoyed as he is, First also can’t ignore his model-like new partner. Is it his potential as a partner... or something else?