agne k
Oxford definition: A person of mystery and secrecy who is often found alone glaring daggers at people in terms of spying on them. These people are often be spies, as their secretive nature allows them quick reflexes and thinking skills to hunt down and observe targets easily, via glaring at them intensely. Commonly, they have appealing personalities and just want people to say good morning to them.
"Have you seen that girl with those big glasses lately?" "Yeah, she's such an 'agne k', behind those glasses she's always glaring."