Found it!.. I shoulda been a detective!

I noticed in the bottom corner at the end of the clip was a musical note - the Tik-Tok logo! For those who are not familiar with it Tik-Tok is an app for sharing music-based short videos. Underneath it and the Chinese writing was a bit more Chinese writing followed by "hanxia5201314". I wondered if this was the user-name of the Tik-Tok account so tried searching for it on the app but that came up fruitless. I then searched for it on Google, which led me to this page:
https://xiaohulu.com/video/user_detail?plat=201&roomid=97965215465 'Bingo!' I thought, but it turned out that this was full of dead links and none of the videos would play

.
I eventually found some working links by copying and pasting some of the Chinese characters from that page into Google and found a Facebook page hosting all the videos publicly. I think the page probably belongs to (or is a fan page of) one of the Chinese girls actually featured in the film! I've gone through all the videos currently on the page and posted links to the ones below that folks here are most likely to be interested in.
It looks like it's from a Chinese short film which when translated is titled something like "Dream Catching Girl", "Dream Chasing Girl" or maybe "Chasing the Dream Girl"? Whatever

So Here's the full scene where that short clip Bash found was taken from (in two parts):
https://www.facebook.com/ZHIXI6/videos/322542431922843/https://www.facebook.com/ZHIXI6/videos/356640598217909/Here's a bit of 'clean-up footage':
https://www.facebook.com/ZHIXI6/videos/391876298022810/This part starts off wet but gets muddy after the first 55 seconds, and ends up with a really nice muddy tug of war!
https://www.facebook.com/ZHIXI6/videos/1309771042499442/Here's a 16 minute clip, which features all of the above scenes:
https://www.facebook.com/ZHIXI6/videos/223518748550675/And here's the whole film on Youtube!:
https://www.youtube.com/watch?v=s_nrLlX3AJQ