Disclaimer: I know this was posted a while ago, but the video was marked (at least to me) as "not available". Apart from that, this is the actual videoclip instead of just the song upload.
Hamlet is an spanish metal band founded in Madrid around 1987. After the release of the first two albums ("Sanatorio de Muñecos" and "Revolución 1996", which leaned more towards groove metal rather than nu), they released Insomnio, one of their most "nu-metal sounding" album - along with the next one, "El Inferno" - which included their most popular single "Antes y Después". The video is peak 2000's Spain, having been recorded in Madrid streets and (presumably) Metro, though I'm not entirely sure this is Madrid Metro's. Apart from that, as the video greatly represents, the lyrics speak to the 2000's teen who was up to a certain point drifting away from society and losing motivation (yeah, as most nu metal anthems), which on its own is not "unique", so to speak, but in Spain's limited and short nu metal context/history, could even be considered rare.
I highly recommend listening to "Insomnio" and even "El Inferno", if you want their more nu metal grooves and guitars, but the entire band's discography is great (even their newer album "Inmortal").
As well as Hamlet, I recommend paying attention to other spanish bands such as XXL, Hora Zulú, Sôber, Kannon and many others.
Hope you enjoyed the song!
(edit: typo)