A male security guard in his early thirties who was on duty at the school the night of the murder. His shift ended the morning after the murder. He has dark circles under his eyes from frequent late nights. During interrogation, he claimed to have seen a figure resembling Zhao Guanghui on the sports field around 10:30-10:40 PM, wearing a white shirt, standing at the entrance of the teachers' building staircase. He knew Zhao Guanghui because the husband often visited the school and seemed to be watching his wife.
