Na jaemin is a mute man unable to speak. a man who is always bullied at school for being mute, jaemin has a stepbrother whose age is a year different from his, his name is jeno. jeno also always bullies jaemin everywhere, he always tells jaemin to do his schoolwork and always accuses him of any reason. biological father his always compares jaemin to jeno, jeno is always perfect and handsome, but jeno is not as smart as jaemin, jaemin is a new student at Haneul school.