Lee Hayeon never meant to gain feelings for anyone on the anonymous tutoring app her friend built. Kim Hyun never thought the girl he talked to online would be the same one who barely looks his way in class. When Lee Hayeon's best friend creates an anonymous tutoring app, she agrees to help under one rule: no one can know it's her. But one message changes everything. Behind the screens and secrets, two people start to gain feelings, not for the faces they know, but for the words they don't.