One method:
$ grep -o '\S' file | awk '{a[$1]++}END{for(k in a)print a[k],k}'
3 옥
4 h
2 u
2 i
3 B
5 !
2 w
4 爸
1 군
4 지
1 y
2 l
1 E
1 會
2 你
1 是
2 a
1 不
2 이
2 o
1 p
2 的
1 d
1 생
3 r
6 e
4 s
1 我
4 t
Use redirection to save the output to a file:
$ grep -o '\S' file | awk '{a[$1]++}END{for(k in a)print a[k],k}' > output
And for sorted output:
$ grep -o '\S' file | awk '{a[$1]++}END{for(k in a)print a[k],k}' | sort > output