How do I find out who my secret crush is at work ?

I have been working this job for four months so far and last week my closest coworker( she)  told me that someone wants to ask me out and he likes me but he’s very very shy and he scared to do it. He’s also conservative and didn’t want to be unprofessional so he’s holding back.

He doesn’t want me to know who he is apparently.I only have one major crush At work but works in a different part of the store.We have talked here and there and I couldn’t hide my body language of attraction.  Overtime I can tell by his body language that he’s definitely figured out that I am super into him and when I smile a lot he smiles back. However he has not stepped it up a notch in terms of conversation or trying to get to know me on another level.but here’s the problem; none of the guys I work with especially the ones in my department show signs of interest. It is obvious when men like you and I don’t pick up on a single thing. It is all professional and work related enjoyed conversations. So what my co worker is saying doesn’t make sense to me. I have not seen in for myself and my crush is receptive to my attraction for him but just because someone enjoys it doesn’t mean they like you back.i know there is definitely only about four suspects based on clues she dropped.  but out of that four is impossible to sniff it off of.