The cute girl Hua Qianwu has unparalleled IQ and motor skills, and is a popular figure on campus. In fact, she is a feared killer in a famous organization. Duanmu Haotian, another influential figure on campus, is Hua Qianwu's childhood sweetheart and has been in love with her since childhood. In order to prevent Hua Qianwu from being exposed to the blood, she resolutely joined the organization.