Song's mother found Wu Yiren and took her hostage. Wu Yiren revealed that someone bribed her to ask her to report fake news. Song's mother forced her to ask who the man was. At this time, the security guard came to take Song's mother away.Tang Xiaoqi and Qin Ze suspected that when the fall of the building occurred, there was a third person at the scene, and that person was the real murderer.

The elevator was about to explode, and Qin Ze rushed to Wu Yiren's office to find clues. At this time, Tang Xiaoqi found Ji Chenxi who was attacked in the equipment room.The cycle started and the time was shortened by another half an hour.Qin Ze found two phone numbers during the last cycle. They first called to test Wu Yiren. Wu Yiren accidentally revealed that the fall of the building was related to the freshman at Lincheng University.