Pretty Little Liars' Brendan Robinson, aka Lucas, Was Actually 'Thrown Off' About A.D.'s True Identity

We all have our theories about just who the illusive A.D. is on Pretty Little Liars is — however, star Brendan Robinson was thrown off completely when he found out.

“When I found out who it was, I hadn’t read the script yet, because it was a couple weeks in advance and it didn’t make total sense to me at first,” he shared with ET this week.

Brendan adds, “Then, when I saw the script and I read it and we all sat down – and the people that are involved in those scenes do a really, really phenomenal job – all the questions are answered and it made sense.”

He’s also giving away a subtle hint about the identity of A.D.: “I won’t tell you what specific clues there are but there are hints that have been dropped for a long time.”

Wait, WHAT HINTS?!

PLL fans, do you know who A.D. is? Tell us!