Jung Y/n is a girl facing financial struggles while caring for her younger brother after the tragic loss of their parents. Unexpectedly, she encounters nine sugar mommies who become her unlikely allies in solving her parents' unsolved case. As they work together to uncover the truth, they develop unexpected feelings for each other. The shocking revelations they uncover lead them to the surprising identity of their parents' killer. Throughout their journey, they learn to 'expect the unexpected.'