Concept: one of those “missed connection” type movies where the two lead characters had some past meeting under unspecified circumstances and didn’t catch each other’s names or contact info. It’s basically two separate movies shown in parallel, focusing on the mundane minutiae of their everyday lives, punctuated by their unsuccessful efforts to find each other again via social media and such. Lots of pining and wistfulness and playing up uncanny similarities between their respective daily routines – you know, all the usual stuff.
At the end, after years of trying and failing to reconnect, they happen to encounter each other again, by pure chance, in some ordinary public venue – and after a moment of shocked recognition, they’re both like “you!”, and proceed to pull out a pair of previously unhinted-at handguns and have a sickass gun-fu battle that goes on for like ten minutes and ends with them falling off a building while locked in life-or-death struggle.
Smash cut to the credits just before they hit the ground; the audience doesn’t get to see whether either of them survived and receives no context whatsoever on why they were fighting or how their still unelaborated previous meeting provoked any of this.