I can rewind time to prevent death

Yan Junze threw off the covers and stood up; he hadn't taken off his shoes before sleeping, precisely for the purpose of reacting swiftly in emergencies. He approached the window and stuck his head out from the open pane to survey the surroundings. Outside it was very quiet, and with the help of the dim light, he couldn't see anything unusual. However, Yan Junze seemed to remember that when Xiang Er came in through the window, she had closed it behind her with the back of her hand; otherwise, it would have been very cold sleeping in the room. "Could something have happened, and Xiang Er jumped out through the window?" Yan Junze speculated privately, "Could it be that Huang Chen and that three-star exorcist Li Yue have come in?" With that thought, he felt it was a possibility. He didn't close the window, thinking that Xiang Er would definitely come back later, and turned to leave the private room, opening the door and walking out. He checked the time on his phone; it was already a quarter past two in the morning. Huang Chen and Li Yue should not break the rules - they should not have come to the second floor without his consent, causing Xiang Er to escape by jumping through the window. It was also fortunate that nothing had gone wrong with him in the dream; otherwise, Xiang Er wouldn't have been able to rescue him at all. With that thought, Yan Junze reached into his coat pocket, feeling for the Burst Nail he had placed there in advance. But the pocket was empty, which surprised him a bit, and after searching all the other pockets, he couldn't find the two Burst Nails he had put in the left chest pocket earlier. The jacket pocket was quite loose, and Yan Junze had deliberately opened the pocket with the Burst Nail in it and draped it over the edge of a chair while sleeping to avoid accidentally pricking himself. Now both Burst Nails were gone. They could have fallen out during sleep, but Yan Junze didn't go back to search for them. Instead, he walked down the corridor towards the staircase leading to the lobby on the first floor. As he approached the staircase, he became alert. Standing on the second floor, he heard no sounds coming from the first floor, as if there were no one below. Without rushing down the staircase, Yan Junze leaned over the corridor's railing and glanced into the lobby on the first floor; he saw that all the people were still there, but within the sight range he could reach, everyone was either lying down or sprawled out, all asleep. "Why are they all asleep?" Yan Junze was startled. His gaze shifted to the sofa where Huang Chen was supposed to be, but now only Yang Zhijun and the three-star exorcist Li Yue were sitting there, both with their heads tipped back, eyes closed, mouths slightly open, leaning against the sofa backrest, deeply asleep. "Where's Huang Chen?" As the thought crossed his mind, Yan Junze felt a tap on his shoulder and heard Huang Chen's voice from behind him, "You're awake? I just saw you still sleeping soundly in the private room. You woke up so soon?" Yan Junze's instinct was to turn around, but in that instant, his body froze, and he asked, "What's going on with the people downstairs?" "Oh, everyone is too tired. It should be fine if they rest for a while," Huang Chen replied. "Then why don't you take a break on the sofa?" Yan Junze asked again. "Someone has to stay awake," Huang Chen's voice revealed helplessness and fatigue. "I said not to come upstairs without my consent. Didn't you hear me just now?" Yan Junze's tone suddenly turned icy. Slap! Huang Chen's hands landed on his shoulders from behind: "What do you mean? I was worried about your safety and came up to check. Is that not okay? Also, why don't you look at me when you speak? Turn around, turn around and look..." Before he could finish, Yan Junze suddenly accelerated forward, breaking free from Huang Chen's grasp. Still without turning his head, Yan Junze reached into his pockets again, but still didn't find any Burst Nail. "Don't run, turn your head, look at me! Look at me!" Huang Chen's voice followed from behind, but Yan Junze ignored it, running further into the second-floor corridor. The thudding sound of footsteps began behind him, clearly Huang Chen's solid footsteps echoing on the floor as he gave chase. Yan Junze reached out and touched a row of empty flower racks he passed, finding the two Burst Nails he had placed there beforehand, and he immediately gripped them in his hands. The rapid footsteps behind him drew closer, but due to the curved design of the corridor, creating a certain angle, the figure pursuing him was still not visible. Yan Junze quickly pushed open the door of the farthest private room, one that had never been opened, immediately turned on the light, but whether it was the lightbulb or the wiring, none of the lights in that room worked. With no time to spare, he entered quickly, closed the door, then turned to lock it, only to find upon twisting it that the lock was broken and couldn't be secured. Without a second thought, Yan Junze rushed to the unopened window of the private room, turned around to face the door, one Burst Nail clutched in each hand, rubbing the pointed end of the Burst Nail against the pad of his finger to ensure he could press down at any moment. Thud, thud, thud... Huang Chen's heavy footsteps neared, his hand reached for the doorknob of this private room, twisted it, and pushed the door open. By then, Yan Junze was facing the door and could see the stout figure step into the room. "You're not Huang Chen, I'm still in a dream!" Yan Junze declared. "So you've turned around. That doesn't count, you know. You have to turn your head," Huang Chen's tone became eerie. Now certain that he was still in a dream, Yan Junze had no expectation of a reply from him, and at the same moment he spoke, he activated [Perception of Strange Events]. In this event of turning one's head, until now Yan Junze had not discovered any task information, nor had he concluded where the real identity of the Black Dress Woman might be, so he had to test one by one.