the Duke Yin of Zhou dynasty was occupied in devoping the production
many slaves were forced to work from morning to evening.once an aged slave had been fatigued while worked harder.at the day,he stretched and went to work,at the night,he sleep sound.one day he dreamt to become a king and ruled the subjects as his wish……
and the Duke Yin was also tired and he dreamt to be a slave,who was badly treated……
大体意思就是这个了