I want OLDBOY spoilers

[GTL]

was just watching this movie and a scratch on the disk meant i couldn't see the end of it. I was getting a little bored with it to be honest and don't want to wait to get another disk. so someone please give me a reasonably detailed synopsis of the ending.

The last scene I saw has the lead character (I am really bad at remembering names in subtitled flicks) in a school running after the girl who is apparently about to die.

PS - I didn't think this film was as great as some people make it out to be. The one fight scene with the long single tracking shot is one of the best I have ever seen though.