At dusk, Jiang Zhengkai once again had Mu Mingyuan do A-Jiao's makeup. The two then left the sub-bureau for the alley, to inspect the room that had been put under surveillance. Just as they were about to leave, however, Liu Na entered the office holding a report and a compact disc. 

Liu Na handed Jiang Zhengkai the items. “Inspector Jiang, here is a report of the noise analysis of the room on the night A-Hui died. Xue Na just delivered it on request of Commissioner Yao.”

“Really? The central bureau was quite fast this time.” Jiang Zhengkai pointed at Liu Na's computer, “We'll use your computer! Play it for me.” Liu Na took the disc back from Jiang Zhengkai and inserted it in her computer. Meanwhile, Jiang Zhengkai turned his focus to the report. 

“Si la…… ah oh……. ha eh……” A series of weird sounds came out from Liu Na's computer. “Inspector Jiang, these were the original sounds from that night.”

“That's...