C471 Do you have urine

Do you have urine?

"Oh!" "Alright!" Jiang Yunfan looked at Zhou Zheng with some surprise. He was curious as to what method he could use to open this wall in front of him.

Zhou Zheng smiled mysteriously before arriving before the wall.

Zhou Zheng first pressed his ear to the wall, then listened and knocked on it a few times. He had a serious expression on his face