I was practicing Qigong at that time, and I would look for a quiet place to stand in a Qigong posture after the lights went out every night. After the onset of summer, because I couldn't bear the mosquito bites by the river, that day I moved my spot to the school botanical garden. It was the most secluded corner of the school, with few people around normally. I had just started practicing when I heard the sound of someone walking, so I quickly stopped and hid. There weren't many students in our school, and I was already a senior third-year student then. I practically knew all the boys and girls in the school. I could tell who these two people were just by the sound of their voices.