Hey Jaeona, I know this video is old and you probably don't remember. But do you know the name of the avatar you used in the beginning of the video before you switched into the guy? Maybe you have the original recording of the video and it says the name of it, or something else who knows, let me know if you know anything. Thanks!
Oh God that was such a long time ago, the avatar itself was by _Yari and they had an avatar world. That's where I got it from. Now this specific avatar was deleted from my list because it had the old 2.0 animations and the old dynamic bones. Not sure if Yari is still active, but their world was also deleted and they changed their name into something korean. So I don't think the Avatar would exist anywhere, it's a pretty old model sadly.