The morning classes were Advanced Mathematics and Linear Algebra, content that Lin Fei had already self-studied in advance. As a result, during class, he merely sat at his desk, putting on an act while actually flipping through the last parts of fluid dynamics. His two roommates beside him, Du Xiaosheng and Shi Ran, were quite different; the former listened intently to the lecture, while the latter lay on the desk, dozing off.
This was the routine for several consecutive classes. Du Xiaosheng was always highly concentrated, and Shi Ran consistently napped on the desk, changing positions constantly. Lin Fei, on the other hand, sat alone, flipping through books borrowed from the library, as if no one else was there. The three were distinctly different. When the teacher approached, Du Xiaosheng immediately nudged the two others, and everyone straightened up and switched books with precision.