Due to his being preoccupied with the Hasty Murder Case, Zhao Yu had yet to look into the new functions carefully after the system upgraded for the second time. It turns out that it had greatly improved in many ways.
One of its improvements included the Memory Flashback Device that he had used earlier. Zhao Yu had used it to replay the scene when Cui Lizhu first got home, then he had used it to confirm that the surveillance device on the fridge wasn't set up by Cui Lizhu herself.
Before the upgrade, those scenes that the Flashback Device replayed would have disappeared not long after. However, after the system upgrade, the video clip became like a folder in his phone. Zhao Yu only needed to tap it with his willpower in order to replay it!