Time Agent (Fan Humanities)

Mu Yunjin (original heroine) vs. Li Tianchen I (Mu Yunjin), a time traveler, traveled to my favorite "Time Agent" and gained the ability to trace back time. I also had a system. Although the system only gave me a "survive" task, there were no other restrictions, which meant that I could go back in time and save everyone. But what does "survive" mean? Intention: Regardless of the past, do not ask about the future.