imhangul-gtk3 software package provides Hangul (Korean) input module for GTK+, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install imhangul-gtk3
imhangul-gtk3 is installed in your system.
Make ensure the imhangul-gtk3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep imhangul-gtk3 *
You will get with imhangul-gtk3 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Utilities |
| Package | imhangul-gtk3 |
| Version | 3.1.1-2 |
| Description | Hangul (Korean) input module for GTK+ |
| Sub Section | utils |