Boring Ping

After much hesitation, Anji finally pointed out that she had no idea. It was ultimately impossible for anyone to finish breathing all the air in the world. Even if this room's air were finished, the forest would continue to supply it with new air. If the forest ran out of air, the sea would continue to bring in new air with the wind. The wind will never stop coming in, and in a way, there will never be a shortage of air.

When Yan Ping heard her reply, she agreed.

"That's right," she confirmed. "It would be completely impossible for anyone to finish the air. That's why we have a symbol representing infinite, which means endless. Once you understand this, you'll understand the reason why zero exists. If something is endless, it has no number. If something doesn't exist, it also has no number. However, when creating spells, they have to be represented by something. That's what zero is. It's the representation of nothing."