Lu Xiaobu didn't care about Elder Yu's thoughts and directly opened the upgrade interface.
As expected, just as Lu Xiaobu thought, the Military Helicopter can be upgraded through the Military Helicopter.
However, this also made Lu Xiaobu a bit puzzled.
He remembered the system saying that grass couldn't be upgraded with more grass, it needed an upgrade direction, but Immortal Bean could, and now so could the Military Helicopter.
What exactly is the difference between them?
Could it be the difference between life form, energy form, and mechanical form?
Immortal Bean should count as an energy form, right?
Energy forms and mechanical forms are more pure, naturally having an upgrade direction?
If his guess is correct, does that mean cars can be upgraded with other cars too?
Can't figure it out, don't understand!
Forget it, not thinking about it anymore.
"Elder Yu, go out for a bit." Lu Xiaobu started to shoo people away.
