Chinese Novels

I'm reading Across Time and Space Detective which has the fun premise of someone in the present being able to communicate with someone 39 years ago, and them working together to solve a heist & murder case that the past character stands accused of (which to the present character is a longstanding unsolved mystery). The author wrote

By the way, the initial idea for this story was to show readers the significant advancements in forensic science over the past thirty years! ><
The true essence of “transcending time” is how old cases that were difficult to solve back then have found breakthroughs with the development of forensic science.
Moreover, I find these newly developed forensic techniques very interesting and want to give readers a bit of insight through my writing.

which I think is very cute.

I like the time travel concept--for the first half of the book it hasn't been too timey-wimey, mostly just discovering things and leaving the timeline intact, but now things are starting to change. They're presumably going to find some way to make the time travel more permanent than just communicating (seeing as they're the main couple) but I'm not sure how yet--other than that since the unsolved case ended with no body found, it should definitely be possible to avoid breaking the timeline too badly.