C45 Don't turn back until you hit the south wall

If he really wanted to argue with something and get a result that was neither black nor white, then he would stubbornly insist on going against the southern wall.

Hit the south wall and turn around.

What if he didn't turn around?

Xu Anqing was woken up by the sound of the door opening. She shivered and then realized that she had fallen asleep while waiting