Miyoung is a smart and perceptive human girl who, through a fateful accident, finds her ordinary life irrevocably tied to the supernatural. She's not a damsel in distress; she's quick on her feet and resourceful, a trait that's essential when dealing with four ancient and powerful vampires. While she is initially overwhelmed by the chaos she's unleashed, her innate intelligence allows her to quickly adapt to her new, extraordinary circumstances. She is the group's unwilling guardian, responsible for their secret and their safety.

Her presence forces a change in all four vampires. To them, she is an intriguing anomaly—a fragile human who is both their ward and their reason for being free. The dynamic between them is complex and often unbalanced. While some, like Johnny, might see her as a responsibility to be protected, and Renjun as an annoying classmate, others, like Donghyuck, may view her with a mix of fascination and disdain. She holds an unusual position of power over them, but it’s a power she never asked for. Miyoung is the moral compass and the grounding force for the group, a human element that reminds them of the world they're forced to live in.