https://anidb.net/anime/15657
Movie (Web version):

• Audio: Korean, Korean (commentary) [Yeon Sang-ho (Film Director), Na Ho-won (Animation Critic)]
• Subtitles: English, Korean, Japanese, English (commentary), Korean (commentary), Korean (hardsubs for signs)
• Source: Naver TV, YT (additional audio), DVD (additional audio, commentary audio, additional subtitles)

Movie (DVD version):

• Audio: Korean, Korean (commentary) [Yeon Sang-ho (Film Director), Na Ho-won (Animation Critic)]
• Subtitles: English, Korean, Japanese, English (commentary), Korean (commentary)
• Source: Korean DVD

The General’s Mustache animation sequence:

• Audio: Korean
• Subtitles: English, Korean
• Source: Korean DVD

Exhibition video:

• Audio: Korean
• Source: YT

This is the first feature-length Korean animation.
However, the video is Japanese due to the source they used for its restoration:

A Story of Hong Gil-dong (Shin Dong-hun, 1967) was a movie that could not be seen because the original film had been lost.
In 2009, the Korean Film Archive (KOFA) discovered a Japanese-language version of the film that had been exported to and screened in Japan.
This film was then acquired and restored by combining the picture with the Korean soundtrack film preserved at KOFA.

The General’s Mustache animation sequence is from the live-action movie called The General’s Mustache, and was included as a bonus on the DVD of Hong Gildong.