name this asian cop thriller film?

The film is from 2000 - 2010

It has a song by robin gibbs on the soundtrack about leaves or rain.

it is an asian, maybe korean cop / detective thriller about a very skilled killer.

the lead is an out of control cop and possibly his well behaved partner dies

It starts with a brawl on a building site with a gang and lots of poles.

It is famous for a scene in the snow on a swing when the cop visits a child relative

and for a crazy fight scene at the end which is a little like a serious anime,

there is also a great chase scene on foot around a built up residential area.

A great, mad, asian film with many scenes in the rain.....lots of rain.

I thought it was called 'over the top' but it is not lol

Any ideas?