The li family is on the run, and the guards have set off flares to signal their retreat. The li's spy has been injured in the skirmish, and he has managed to escape, but he has been taken away by the guards. The spy tells the story of how he and the other guards managed to catch a leader of the enemy's army, but the leader was taken away. The young master tells his wife that the spy is his brother, and that he has to protect him so that he can kill the traitor.