A story of love and friendship unfolds in a school where social media is a defining force and everybody is judged according to the person's looks, fashion sense and popularity. Baek Ho-rang (Jung Da-bin), a high school student, is popular on social media for being pretty and classy, but her standoffish and cold behaviour in person earns her a considerable number of haters. One day, a strange message from an anonymous sender is read over the school radio. The message reminds Ho-rang of a traumatic episode from her past. An anonymous account has also been threatening to blackmail her by exposing her secret. Due to this, Ho-rang decides to join the broadcasting club, led by the perfectionist and overly time-conscious Go Eun-taek (Hwang Min-hyun), in order to track down the person attempting to defame her behind the keyboard.
