On the video "A historian analyzes Korean drama Hwang Jini" the historian said
"Choson(Korea) didn't have wheel."
The source was Korean scholar 鄭東愈 Chung Dong-yu 1744―1808） wrote 「嘗謂朝鮮之俗有至拙者三至難者二 無針拙一 不知養羊拙二 無車拙三 "There are 3 things what Choson don't have, needle, sheep, and wheel"」 on 晝永編 in 1805.
Some Korean said it's a hoax, the book didn't exist.
Here is the proof the book existed.
And I found pictures of actual texts.
It has been said that Choson lacks 3 things, having difficulty with 2 things.
No other countries have the problems.
We do not have needle.
If we didn't import them from China, we weren't able to saw.
That's the first lacking.
6 livestock included cow and sheep.
We have cows but no sheep.
That's the second lacking.
Since Yellow Emperor's period, people have used wheel on the land, boat on the sea.
We have boat but no wheel.
That's the third lacking.
No other countries have the same lackings.
It's been 400 years that scholar-bureaucrats and women never re-marry nationwide.
That's the first difficulty.
Scholar-bureaucrats have to clarify 10 generations of ancestors of both father and mother side total 512 relatives.
Tha's the second difficulty.
No other countries have the difficulties.