Brain Test Level 530 Which one is a spy?

Daze Puzzle provides a complete walkthrough for "Which one is a spy?"

By Emre Parlak /
Question
Which one is a spy?
Hints
Hint 1:
Try to test them by isolating.
Step 1
Answer
You should isolate each one of them by dragging them to the bottom right corner. The spy which is the person in the middle will reveal himself.