SO :)  The beginning and repeating piano riff thingie in Roh Ji Hoon's PUNISHMENT!!! Since I'm really bad with chord names like Csus4 and what not, I'll just give you the notes and you play them together like a chord!!!! YAY!!! Ya na what I mean?

/sugarrush/

F A D
F Bb D
G Bb D
E A C#

So for example "F A D" is like the F chord except instead of a C you play a D!! Yeah? YEAH!  Just following the rhythm from the song and you got it!! :D