C106 Yin-yang lock

After a long and arduous search, they had come up with two heads. They were shocked as they saw a square metal box inside the hole dug by Big Beard.

"Didn't you say that someone had a head? Why is it a box? "

Long Xiaowei frowned and asked.

Big Beard jumped out of the pit, pointed at the square box and laughed: "Look at the size of this iron box, it's square enough to fit a person's head