Bubble Fighter / 버블파이터 .bfz/.pkn ripping?

[luxmaridia]

hi, I am looking for help regarding how to extract .bfz file archives (changed to .pkn sometime around 2015/2016) used for the Korean game "Crazy Shooting Bubble Fighter" (크레이지슈팅 버블파이터). you can view the contents of .bfz files with a zip program of your choice (WinRAR, 7-Zip, etc) or by simply renaming it to .zip, but the .zip files are encrypted, and as far as I know, no one actually knows the passwords for them. 

linked below are some sample files so you can see where I'm getting at. no dedicated unpackers for these sorts of files exist because the game itself is a bit obscure even in its home country, so any help would be greatly appreciated.

https://files.catbox.moe/00oo21.bfz
https://files.catbox.moe/vnim29.bfz
https://files.catbox.moe/hyymbp.bfz (texture files for characters in the game)

[gameripper]

1. Download and start GAME RIPPER
2. Press F2 key, and copy'n'paste the following bytes: E3 6A 7E 44 1E 92 97 51 6E 6E 5D BA
3. Drag'n'drop your .bfz file onto the window
4. Click on the "Decrypt / Unpack all" button
5. If you have more .bfz files, go to step 3.

Note: if you don't know the key then skip step 2, GAME RIPPER can crack ZIP encryption if there's at least one uncompressed PNG, WEBP, WAV or OGG in the archive (which is the case with your hyymbp.bfz file, the others seem to have .msh files only). This uses the Biham and Kocher attack running simultaneously on all CPU cores, so takes only a few minutes on a typical PC.