Xiaoyou loses her memory and falls in love with Yang, a boy who grew up with melancholy. She gets no response, but is protected by Quan, a boy she met when she was young. She thought she would live a simple life, but she is wrapped up in a bunch of lies. Yang turns out to be Xiaoyou's biological brother, their parents were killed by vampires, and Quan is a vampire hunter. However, is all this true? There may be a bigger secret behind this, who is the mastermind behind this, who is the highest leader of vampires, and a war between vampires and humans has begun...