Kroman is ultimate Korean hangul romanization tool. It has a lot of implementations.
This is the Atom plugin.
Install it like any other atom plugin.
Romanize region
Romanize buffer
Romanize and compare
Bug reports and pull requests are welcome on Github at http://github.com/cheunghy/kroman-atom.
Kroman is available as open source under the terms of the MIT License.