Vampire Pi Na Yeong transfers from Romania to Korea, only to find the human world full of things she can’t understand. Following her own rules, she keeps causing unexpected trouble at school and constantly clashes with U Ju, the model student who sits next to her. At first, she finds him nothing but annoying. But the more time they spend together, the more something strange begins to happen: for the first time in her life, her heart starts to race. But there is one rule every vampire must obey. If a vampire bites a human, that person will die within a year. As Na Yeong grows closer to U Ju, both her feelings for him and her thirst for blood become harder to control. Can Na Yeong resist her vampire instincts and stay with the first human who has ever made her heart race?