What sort of things should I buy in korea?

Im visiting korea in around 4 days for 3 weeks. My dad told me to write down a list of things to buy so I wont regret not buying anything after I leave. Nothing electronic since it wont work when I come back, also he said anything under $1000, wow... I've already written down all clothes, shoes, bags, jewellery, cute things from those stationery shops, poster&music. Is there anything else or would that be about it?