A Life Beyond the World

We've all seen this kind of plot in plenty of stories:

The protagonist goes back in time and crosses billions of world lines to save something, all just to find the perfect ending.

It looks grand and moving, but Gu Zhi can only roll his eyes at people like that.

Come on, man. You went off to find that perfect world line, but did you ever think about what happens to the one you left behind? Do you know who's cleaning up the mess?

That's right. Gu Zhi is the one who handles the world lines where the protagonist is gone.

Becoming someone else again and again, repairing broken world lines, until one day, someone softly asks him:

So... what about you? What kind of life do you want to live?