331

331 was a number who worked for 330.

When 330 was hired to kill 10, 331 went with him in an ambulance to kidnap him. He directed 10 and C7 to lie down on stretchers. However, 10 realized it was a trap, grabbing a nearby anaesthetic injection and stabbing it into 331, who fell onto the stretcher. When the ambulance crashed, 331 was left behind.