Song Xiao kept her love for Xu Ke in her heart, and only she and Diary knew about it.
"Seventeen-year-old Song Xiao likes Xu Ke, but no one knows."
Later, after getting together with Xu Ke, he found this diary. After that sentence, it was written, "Seventeen-year-old Song Xiao likes Xu Ke, only Xu Ke knows it. Twenty-five-year-old Xu Ke likes Song Xiao, everyone knows it."
Purpose: Secret love, growth