On the computer screen was an excerpted surveillance video, which was an image of a lecture theater she had visited half a month ago.

She was called away by a teacher after class. Because the teacher was in a hurry, she didn't care about anything else for the moment. She left the computer and some materials in the classroom without taking them away.

After class, the students slowly dispersed until the entire classroom was empty, and Song Mianmian's figure appeared in front ...