"Sometimes,I don't understand you,YoonJi. "Sometimes,I don't understand you,Jungkook. Min YoonJi,a girl with mental disorder,day by day,the pain gets more and more worse. She would always hide her pain with a mask. All she wanted was to have a normal life. After she meets Jungkook,a lovable bunny by day,a serial killer by night. She has no choice. But,she has to be with him.