Chiang Kan was seized with terror but then calmed down and explained,"Since I have not seen you for a long time,I am now paying a special visit to you.How could you suspect me of working for Ts'ao Ts'ao?"Chou Yu said,"Although I am not a clever man,I am not a fool."Chiang Kan bowed and said to Chou Yu,"My dear schoolmate,I didn't expect you to treat your old friend like this.So I will say good-bye to you now."Taking Chiang Kan's hand,Chou Yu said,"Don't be so grim.Since you are not Ts'ao Ts'ao's envoy,why don't you stay here for a while?"Then he invited Chiang Kan into his tent.