How to mute background

Posting this for those who are inconvenienced by the lack of background muting. Feel free to use it if you need it. The usage guide is also included. haha [Reference] https://arca.live/b/lobotomycoperation/146667255 (This is just a rough idea, so you can ignore it.) [Reference] https://arca.live/b/hkstarrail/76184743 (I've uploaded a video and usage guide, so please refer to it.) [Reference] https://github.com/jino9492/background-mute-helper (Everything from usage to installation is here, so please refer to it. haha)