Police officer Nohee is an Unliar, meaning she is completely incapable of lying. However, telling the truth becomes complicated when she encounters the wanted criminal Yeonho. As a Word Wraith, Yeonho can compel others to do whatever he wants simply by speaking—he can even kill them. Due to this astonishing ability, he is now a suspect in the murder of his adoptive parents. Yeonho insists that he does not want to kill people and asks Nohee for help in evading capture. Can she trust this accused murderer and uncover the truth behind Yeonho's case?