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.

We are going to because of the South Korea FUD the we saw in the last time! We also see a dip at BTC every year in January, so do not worry just hold your stuff and wait for the bullmarket. I think the bull will be back soon.
