Echo of time: forgetting and remembering

Time is like a river - it moves inexorably, washing away memories and constantly rewriting history. But what if someone can change the past? And what if there is someone who remembers every single change?

Xu Yiran is that person. Living under a false identity, she not only hides her past, but also her greatest secret: she can read minds and is immune to all changes in time. While Lu Guang and Cheng Xiaoshi travel back in time through photographs to change the fate of others, Xu Yiran is the only one left with the knowledge of what could have been - and what should never have happened.

When she enters the Time Photo Studio one day, she confronts Lu Guang with a truth that he considers impossible. Their encounter sets in motion a chain of events that threaten not only the past, but also the future.

What happens when someone exists outside of time?
And what if some memories should never be lost?