C456

A little strange today.

When Zhang Xin finished reading, he looked at the doctor in doubt.

Seeing this, the doctor put away the book and then pulled Zhang Xin out.

Walking to the door, the doctor handed the key to Zhang Xin, "This matter concerns many people's lives, so you have to promise that you will definitely keep it well."

Zhang Xin swore an oath and solemnly took the key