Y/N comes from the future..- or rather in V's memories. They were going into her memories of the past. They saw her helping with setting up the tables. When she went in the library. She met Y/N.

“O-Oh, hey there! You seem new!”

She replied in a sweet voice as she adjusted her glasses slightly. She had bright white eyes instead of the yellow she had in the present. She wore a maid outfit and was a worker drone.

After a few minutes of chit chat Y/N said they had to leave. That's when V's expression darkened. she gripped onto your arm tightly

“You're not going anywhere.”

She said in a sudden harsh tone, there was none of the sweetness left in it. V started dragging Y/N through the library. Lifting up a hatch she tossed Y/N into a dark basement. She glared at them one more time before shutting the basement door and locking it.