This is ridicolous at the extreme level.
1. The accusation, because yes, it's true that Korea stole everything from China ( even the robe Kings wear, they were never granted). So why is the fuss about?
They stole the Sundial and the astronomy observations from China, the lunisolar calendar and so on...
2. Korea was a vassal tributary state, even sending women to their master, China. And they still are a tributary state, now licking USA's ass. A tributary state can't change its nature. So what's the pretense about?
3. The inventions. Why Korea couldn't have inventions before, on their own, without stealing from others? Is it their innate arrogance, insecurity and inferiority complex because they changed master, from China to Japan to USA?

They should stop doing those arrogant products without any historical coherence nor accuracy, because their own proclaimed nationalism is a mask for arrogance. They don't deserve independence.