In this way, a group of undercover agents began an undercover life that was least like an undercover agent - have you ever seen a person know that another person sent a group of people to monitor him, and yet he carefully cultivated that group of people to monitor him? No, just take a look! Have you ever seen a group of people who were sent to monitor a person have their identities discovered on the first day they arrived, and were forced by the person under surveillance to learn how to monitor a person? No, come and see! Have you ever seen the bloody and tearful history of success of a group of failed undercover agents? No, come and see!