Hello Rumpel9,
like the others I am convinced that it's not Korean also when I don't know something about Korean swords but I think to know what you have there, it's a sword from the Dai poeple (so they get called in Yuan) or Tai Lue (so they get called in Laos), think that your sword is from the Lao side, 19th century. Interesting sword for sure but need a lot of work, the blade is in a bad condition. Nice Daab!
Regards,
Detlef