Where are the neon lights?

Where in Seoul can I find the most concentration of neon lights in the street like I see in Korean movies?

The streets and alleyways behind the tourist info place is neon central (can't remember the street for tourist info, but it is right beside the river)

It's probably harder to find an area that doesn't have a lot of neon signs than to find one that does.

One area with plenty of signage are the streets and alleys around Gangnam station (subway line 2).

Jongno has loads of lights, especially the street parallel to the main road, on the Namsan side, between Pagoda Park and Jonggak station.

Sinchon isn't bad either.

Meyong Dong at night (Line 4, Meyong Dong station).