UPDATE: I found it, it was Covalent Bonds

Thank you for finding it for me, InfinitExotic!

OKAY.

Y'know that thing where you remember all these details about a fanfic, but you can't find the goddamn thing? Yeah, I've got that right now.

Help me find it?

So. It's here on AFF, it's VIXX and based on the movie Now You See Me.

N, Leo, Ken and Hyuk are the magicians and Ravi and Hongbin are the cops chasing them. It actually followed the movie pretty closely except there was this random date with N and Ravi at some sort of boulevard/promenade-thingy somewhere in the middle of the story.

Pairings are N x Ravi, Ken x Leo (and probably Hyuk x Hongbin)

There were these little doll keychains, but I don't exactly remember whatever was up with them. I think they were instead of the (invitation) cards in the movie?? And there was something during the date with them as well...

Anyway, the final scene of the reveal of the mastermind was at a fountain iirc and all six of them were present.

I don't remember what everyone's area of expertise with magic was, but someone had fire. And someone had illusions??? Maybe Leo had like mindreading?? It's kinda turning into guesswork here.

Anyway, I think I should have provided enough details to recognise the story if you've read it. Please comment if you know which story I'm talking about.