Lu Qing came to the window and gently opened a small gap.
Through that gap, a white jade waist card was handed in. Lu Qing was momentarily stunned upon seeing the card. He opened the window a bit more and saw a figure, like a phantom, crouching on the narrow window frame outside, dressed in black.
The person in black was wearing the clothes of a Chifu Guard, which Lu Qing recognized.
With one hand holding onto the protrusion on the outer wall, it was naturally impossible for him to salute Lu Qing. He nodded slightly as a gesture to Lu Qing. With his free hand, he pulled down his mask slightly so that Lu Qing could see his features, and then hid his face back under the black mask.
It was a face he had never seen before.
Moreover, it was the first time someone in Chifu Guard attire had voluntarily removed his mask in front of him.
Lu Qing suppressed his doubts, keeping his expression neutral, and took a Mechanical Box from the person's hand.
