Cui Xiao once believed in pure love, in childhood sweetheart romance literature, and that someone would choose her with certainty. But childhood sweetheart Xie Xun treats her like a younger sister, band lead singer Wei Ji treats her as a betting chip, and aloof superior Fang Qi breaks into her life with an assertive posture. After wave after wave of heartache, disappointment, and awakening, Cui Xiao decides to no longer be anyone's spare tire. But when she finally turns around, the three men regret it more than the last. The childhood sweetheart has his defenses broken and confesses, the succubus lead singer lowers his head to seek reconciliation, and the aloof CEO learns how to love—holding her express delivery in the center of the Shura field, Cui Xiao just wants to ask: what on earth did I do wrong?