C300
Luckily, Xu Lu was not too lazy.
He found a diary. Xu Lu didn't write much, writing occasionally about her mood, taking a line from a movie, and even writing about how she had a crush on a boy in her class. From the beginning to the end, he did find two diaries that mentioned Yao Jiayue.
The first was written two years ago. Xu Lu called Yao Jiayue a good friend in her diary