Who are you? School 20 15 Why did Gao Enxing suddenly change his temperament after reading the materials? What is the content of the information?

It was Zheng Xiuyin who sent a short message to Yin Sheng with her dead sister's mobile phone, which made Yin Sheng mistakenly think that her sister was not dead and threatened her to live in the pain and fear of killing her sister! The specific content is nothing more than saying: even if you don't pretend not to know me, we are still good friends or something, because we can only guess if we don't see it!