When I saw the prices of crypto currencies there is almost every coin's price fell upto 20%.Do you think this is just happening due to South Korea's ban over crypto currencies or there is other reasons for that.
I hope the condition will be back normal soon but I am worried a lot.

I think you are new in the trading, you tend to worry easily. Their are lot event with this kind of dump and it is more bigger dumps. I do suggest that you will look your folio once a day because i think in the following days it will be more dumps and i think it would be next week before it could recover from falling. If you are really a trader you should know that there will be a lot of dumps before getting a profit so just hold it more, it wouldnt be dumping forever, later on it will be pumping.