Jo Hye Jin commonly known as Jo is just like any ordinary teenage high school girl. She has a strong determination to excel in her grades and acclaim the first position just like she's been doing for the past ten years. She is ambitious and focused on her goals. Jeon Jungkook is not like any Day clan vampire. He holds the strongest bloodline of the Day clan. He isn't aware of the power he is capable of attaining. He does not hold any affinity in violence. He is rather a merry teenager-looks-but-decades-old boy. He instantly acquired feeling for Jo when he helplessly trespass her room. Despite the fact that he won't age but she will makes him frustrated yet he does not want to miss this opportunity. So, he joins her High School but things do not turn out as expected. Mark Tuan, a member of the Night clan. Stronger than most of the day clan. He is ferocious and believes that violence if the best way to resolve issues. He sole rival is Jungkook and wants to avenge the death of his great grandfather by killing him. He gains interest in Jo after he finds out that Jungkook is interested in her but he too falls in the pit of love. Love can make you lose your sanity or gain your sanity. This fiction is about how a girl makes a boy lose his sanity and another gain his sanity.