I wrote this about two weeks ago, and while I was dogfooding myself for daily usage some other implementation of Korean keyboard have emerged. I think I should announce this much earlier to reduce duplicated work.

Based on Japanese Keyboard layout's custom input handler methods, I wrote a Korean input methods for Jolla.

Differences from Ascense's code:

• Korean input handling Javascript code came from other Javascript-based Korean IME at http://ohi.kr/.
• Some minor keyboard layout differences.
• The ISO 639 language code of Korean is 'ko', not 'kr'. This is common misconception.

Some known bugs:

• Some composing characters may appear after pressing space or backspace. I am investigating this: for workaround, press space and remove traces. Fixed in version 0.1.
• Input handler changing sometimes not working. This is not solvable unless Jolla provides official API to do this. Switch to other layout and back to Korean solves this.

Grab the code here: https://github.com/peremen/jolla-input-ko

Now available at OpenRepos: https://openrepos.net/content/peremen/dotdanbae

Too bad that I announced this too late and not uploaded to anywhere