Infection

Syst went walking in the streets of Pero Diaz, closely observing his target. After a monotonous five minutes of following him, Syst went forward and approached him. The target turned around, and said, "Why have you been following me?". Syst came to a halt. "I have a suspicion."
"What of?"
"Lift up your hood."
"Why should I?"
"Just do it."
The target shrugged and lifted his hood. His features came into view. He looked like he was around his mid-twenties with dark violet hair, so dark as to be black. He had a hawkish nose, and eyes which Syst had difficulty making out the colour of. His neck bore a small symbol by the jugular vein, something that resembled a "c" with longer ends and a slash cutting through it and curving downwards to the left. He had a look of disinterest as he faced Syst.
"I was right! You're an AIDA!"
"And?"
"My name is Syst. Might I know yours?"
"Name? People have called me Lieth before."
"Nice to meet you."
"And you."
"I was told you would be the right sort of person for a little something I have in mind."
"And that would be?"
"Join my guild. I'll tell you everything. Suffice to say, it involves dancing with the law."
"Ah. That's fine by me. I hate it anyway."
They walked off, discussing about plagues in Pero Diaz.