the thing is korea always was a one team region. they never had more than one team with relevance at the same time, even regionally, pre-franchising, while LATAM was getting two teams to internationals because they could actually win LCQs (with harder opponents)
after franchising this got better because LATAM got on a league much harder than KR with less teams. but KR still havent got over DRX until GENG in 24. thats why now they got an advantage: their international runs were in fact better and now they have more than one team.
but my point is: as a region, they're not very far from each other. you cant say one is underdeveloped and the other isnt. KR has more international runs, but LATAM has classified to internationals more times. KR has advantage because of the masters title but, outside of that, theyre pretty similar on international runs too.