Kim Yeo-ju, Kim Tae-hyung's younger sister with aphasia

Kim Yeo-ju, Tae-hyung's younger sister, suffers from aphasia. Tae-hyung treats Yeo-ju as if she were his own girlfriend. Unlike Tae-hyung, Yeo-ju is embarrassed by her brother's muteness and avoids him. But what happens in the end? Are you ready to hear it?