here is my list of kpop that are old but still gold
enjoy

FT Island – I Hope
2NE1 – I Don’t Care
4minute – Hot Issue
SNSD – Genie
2PM – I Hate You
Epik High (feat. DH-Style) – Fly Higher
Super Junior – Sorry Sorry
Brown Eyed Girls – Abracadabra
SHINee – Juliette
G-Dragon – Heartbreaker
Kare – Mister
f(x) – La Cha Ta
SHINee – Ring Ding Dong
2PM - Heartbeat
SS501 - Love Like This
2ne1 - Fire
Miss A - Bad Girl Good Girl
2NE1 - Can't Nobody
Girls's Generation - Run Devil Run
SHINee - Lucifer
SHINee - Married To The Music
Super Junior - It's You
T-Ara - Roly Poly
TVXQ - Keep Your Head Down
Infinite - Inspirit
CNBLUE - First Step
FTISLAND - I'm a Loner
N'uest - Face
BigBang - Haru Haru
Girl's Generation - I got a Boy
Girl's Generation - Lion Heart
T-Ara - Lovey Dovey

so thats it for this list :)