General Mung Beans
Banned
It was only until Japan industrialized was it able to surpass Korea technologically and colonize it. Of course, to be fair, Japan was probably more culturally and economically advanced than Korea.
No it wasn't. Korean has superior craftworks and after the Corean-Japanese War of 1592 several thousand Corean craftworkers were taken as prisoners.
Furthermore, culturally, Japan was very developed, as evidenced by kabuki, noh, and the tea ceremony.
Only because they were STOLEN from the Coreans.
Anyway I think by the 19th Century Corea conquering Japan would be hard-very hard unless Japan doesn't modernize. A better scenario would be Corea having a Sino-Corean war where Corea annexes Manchuria and maybe Shandong and Formosa. You'll see Korea ally with the Central Powers especially Germany against Japan who'll like OTL will probably ally with Britain.