Korea is the safest country i"ve ever been to. The crime rate is dramatically low. I don"t fear walking down any street at any time. The same rule applies for men and women, especially foreigners. A Korean would not try and pull anything with a foreigner, because they will get in a lot of trouble if caught. Howeve,r like I said it"s quite rare here.
Koreans are generally non violent people in public. Behind closed doors is a different story though. But to make you feel more comfortable, if you"ve live in Japan for 2 years and had no problems then you shouldn"t have any here.
한국은 내가 방문한 국가에서 놀라울 정도로 가장 안전한 나라였다 ^_^동의 ^_^