When they were doing missions, they would be assigned codewords they needed to say to make sure that they didn't recognize the wrong person. After all, many of them would not recognize who were who when they started doing their missions out there. Because of this, they had a set of codewords they had to say when they met with others.
The set of codewords seemed like a simple conversation, but it would be impossible for other people to imitate because there was a set of words that had to be followed strictly.
The young Qing Shu Lian might only be in the organization for a short period of time, but had already learned about this because he had to be part of several missions.
Though, his tasks were nothing more than delivering weapons.
The young Qing Shu Lian was a bit nervous, though. Because if these weapons were found by the guards, then he would be put in the juvenile detention because of his actions.