The protagonist Ye Xin has been a cowardly and introverted person with no independent opinions since childhood. After going to school for the first time and being bullied for the first time, she became even more cowardly and introverted and even unwilling to contact others; her sister Ye Si is an optimistic and sunny person. As long as she knows that her brother is in trouble, she will lend a helping hand every time. She loves her family, but she is always hurt by her brother's silence. Ever since Ye Xin was in the first grade, her elder sister has been silently paying attention to her younger brother's school life. She would always help him when he was disappointed, but all care would slowly deteriorate. Especially after experiencing so many sad things in the first grade, Ye Xin became more withdrawn and taciturn...