Korean is not properly input

Bug Reports
1

Korean words are not properly input.
For example
correct way -> 안녕 세상!
How runkit shows -> ㅇㅏㄴㄴㅕㅇ ㅅㅔㅅㅏㅇ

Thanks

2

input?

console.log?
https://runkit.com/iugo/5cf5d1fcc62ae4001a5ef3a0