Lin Shuxing, a genius girl from the Department of Mathematics, suffers from "facial recognition disorder" due to childhood trauma and can only identify others through sounds and details. She developed "Echo", an anonymous social networking app on campus. Users can match people with whom their souls resonate through an algorithm, but they never dare to participate in the matching. Jiang Yubai, a male god from the Department of Computer Science, appears to be the head of a rational AI laboratory. In fact, he has been taking antidepressants for a long time due to family pressure. He secretly uses the virtual identity "Zero" to observe human emotional data in "Echo".
In an experimental accident, Jiang Yubai discovered that Lin Shuxing's algorithm could accurately predict users' emotional needs, but it could not be commercialized due to her mental disorder. He approached her anonymously and guided her to face her fears in the name of "fixing algorithm loopholes." The two exchanged secrets through a "voice diary": she confided her longing for her crush, the boy at desk 7 in the library, and he revealed his resistance to his mother's control.
