C2023 An Unusual Mark

Just as she was gone, a figure flashed into the bathroom. It was the cleaner. She carried a bucket of water into the bathroom, then went straight to the trash can and took out a paper bag.

She opened the paper bag. Inside was a book, "Painting Book." He shook the book and a card fell out. The card read:

"Code 020454."

"Twenty thousand."

[Haha, I earned twenty thousand in ten minutes