Lol.. did it become a hidden purchase. Liddat u might need to use pc de itunes to unhide the purchase.
WTF for real? What happened was i added it to my korean playlist liao but forgot. So i added again. End up 2 of the same songs. So i deleted one. But dunno why both got deleted.
It happened to another song too but that one when i went itune store & tried to purchase again, it said purchased already & asked if i wanted to download. That solved the problem.
This one same story but when i tried to purchase again the option is not even there, just shows purchased.
Edit: Ok you were right. It WAS hidden! How the hell I don't know. I certainly did not want to hide it. So after unhiding it on PC now it appears in my phone. WTH?!?!