When others travel through time, they go to another world to be saviors.
When He Zheng traveled through time, he went to another world to purchase goods - and then packaged them and handed them over to the country.
A retired special forces soldier opened a small supermarket. On the first day of business, he opened the door and saw a wasteland and an apocalypse outside.
This store is evil: Zombies cannot break through the door, he is invulnerable in the store, and will be teleported back to reality on time 48 hours later.
The crystal nuclei he brought back silenced the academicians on the spot; the drawings he handed over were treasures lined up by the National Academy of Sciences.
The end of the world is just the starting point - the door will open to ancient times, to immortality, and to more worlds that are unimaginable.
As many worlds as he has traveled, he can bring back as many good things as he has left behind, leaving them all to the country.
So the country has an extra door and an extra road for overtaking in a curve.
And He Zheng is the only gatekeeper of this door.
