"You go up, place this on top, make it inconspicuous, and don't let anyone discover it."
Xi Qianxue handed a pitch-black object to Du You. It looked like it was polished from a chunk of coal, yet somewhat different.
"What is this?" Du You asked, holding the object.
"It is an alchemical product, capable of recording images, but can only record once. The advantage is that it can't be falsified, it's more conclusive as evidence than anything else."
"So we're spying. Does this world have such things?"
Knowing what Du You was worried about, Xi Qianxue quickly explained, "This is indeed a product of this world. It's very valuable, even scarce in Border City. It's obtained in exchange for exceeding merits. Don't worry, I won't use something that doesn't exist in this world as evidence. That could easily cause trouble."
This wasn't something only Xi Qianxue had done, many others had done the same.
