This is simply a correction/consolidation due to recent news announcements and confusion over what is happening in Korea.
It was a dissapointing day for short term gains, but a healthy market can not sustain massive bull runs without bear consolidations.
As well as that, with so many exchanges slowing up and not accepting new accounts, a lot of potential investments are not being made.
2018 is the year for cryptos, so keep calm in these situations. If you have really researched your investments and believe in the tech. Behind them, you will be fine!