So...a pill furnace? Yeah I've definitely read a few too many wuxia web novels.
But tbh it looks like one of the bronze basins where you run the two handles and cause the water to jump or something.
K-dramas are great. Watching in subtitles isn't a problem, if anything it opens the door to so many different cultures and media.
What if whoever Jiang Bai is hunting is related to this girl somehow?