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Greene couldn't figure out the answer his master had given him, no matter how hard he tried.

Seeing him scratching his ears and cheeks, yan Xin smiled and said: "Greene, do you think this world is either black or white?"

"Isn't it?" Greene replied.

"That's because you don't understand human nature enough."

Yan Xinjue sighed, "Often, there is no strict boundary between black and white