C566 Old friend

It was like a stone giving rise to a thousand ripples, the calm surface of the Yanjing was surging, and many hidden forces were beginning to emerge.

On the east side of Yanjing City, in a large courtyard, there was a tall, concrete wall as well as a square brick-paved floor. Mixed in with the black and white, clear yet round cobblestones, they vaguely matched each other