"May I ask why your code is Zero, senior?"
Zero stilled yet he didn't say a thing because he also have no idea why. He was originally have no code. Until one day, his father gave him the code 'Zero', as in 'nothing'. He thought that maybe, because his father really don't put him in his eyes after so many years. He thought that maybe, his father still blames him for his own mother's death. But, time passed by, and his interest for knowing why he was named with it vanished and was replaced by dedicating himself for the missions posted in the BMA's bulletin board.
He just shrugged his shoulder, admitting his ignorance. Then, he spoke, "I don't know, because it wasn't given by myself."
The agents are surprised to know such a crucial information like that. But, in BMA, Zero's way of being
