BTS is at the intersection of global fandom these days -- but right now, they're literally at the intersection of Genesee and Beverly in Los Angeles -- with none other than James Corden.

The Korean pop band -- consisting of a whopping 7 members -- appears to be involved in a major showstopping number in the middle of the day, and in the middle of the street too ...

right outside of CBS's Television City in the heart of L.A.