To unlock the door and search Wenjie’s quarters in What Wenjie’s Want in Laboratory Annex in Deathloop, progress through the What Wenjie’s Want visionary lead until you find out what the code is. Go down the stairs to the Laboratory Annex and unlock the door using the code. For me it was 2356.

Walk over to the two whiteboards and read the note attached to the right whiteboard.