Ena is an office worker who has always struggled with intimacy because she has difficulty becoming aroused. One day, she discovers erotic situation voice recordings online and realizes that she is particularly sensitive to certain voices. Soon after, she encounters a handsome, mysterious young man whose voice is strangely familiar. When he speaks softly into her ear, she finds herself unable to resist his charm. As their relationship develops, Ena discovers that this mysterious younger coworker has been hiding his true personality behind a reserved appearance. His sincere feelings for her gradually bring them closer, leading to a passionate office romance filled with unexpected surprises.