I'm looking for a (I think it was) Chinese webtoon. In it the fl got together with the ml from the beginning, but ml died while doing policework or something. And a few years after that the fl finds his (ml) or her own old phone and when she started it up it somehow connected to the ml from before they even met in the first place. While once in a while calling each other somehow small things change in the timeline.

I was thinking of reading this again, but as I'm not sure of the tags I can't find it. Thanks in advance if someone knows!