o react.Everyone held their breath, completely focused on watching the two people furiously scribbling down the problem-solving steps.In the office, Lao Lu stood up and looked for a long time, a satis...at Xu Yixue's photo.Xu Yixue is a top student at Peking University. Everyone, from teachers to cleaners, knows her. After learning that Xu Yixue had indeed returned three hours ago but hadn't been see...