Yang Y/N-The girl who fell inlove with his vampire best friend. Park Sunghoon-The boy who fell in love with his best friend. Yang Jungwon-Y/N's cousin and he knows about Sunghoon too. Our friends Lee Heesung Nishimura Riki Jay Jake Kim Sunoo Actually, Sunghoon and Y/N are childhood friends. And Y/N knows that Sunghoon is a vampire. So Y/N protects Sunghoon everyday.