Song Yuqiang said dejectedly. "Wasn't that night my brother's birthday? I’ve been studying away from home all this while. This year was my brother's 30th birthday. I bought his favorite chocolate cake to celebrate his birthday... I rang the doorbell that day, but nobody answered. But the lights inside were on. I went round outside and looked in through the window. I was so scared that I dropped the cake on the ground. He... He had collapsed onto the floor and his body was covered with blood... I knocked with all my might on the window and called him, but got no response… I was terrified, so I came back quickly."

Chen Shi asked, "Why didn't you call the police?"

"I... I was terrified. My mind was blank."

"You didn’t even inform your parents?"

"How can I tell...