C140 Young Children Cannot be Taught

He didn't expect that he would give Han Wushang such a lesson today. He had obviously taught Han Wushang this lesson a long time ago, so why couldn't he remember it in his heart? Why did he forget it so completely? Zhao Bing didn't understand. Was his teaching method wrong, or was the person before him a rotten wood that couldn't be carved? From the looks of it