KBO hitters... Looking strictly at batting ability, what is the reason it is difficult for them to succeed in the Major Leagues?

Kang Jung-ho
was highly active in the Majors due to his hitting power,
but his career was too short.
Ha-seong Kim... to be honest, he has a strong "SS-3B utility" defensive specialist profile.
Hye-seong Kim, Seong-mun Song..... they are bouncing around the Minor Leagues.
At least Jung-hoo Lee...
but although he is currently playing as a starter for San Francisco, considering he was the undisputed #1 hitter in the KBO,
his performance is well below expectations.
The ones we can expect something from
are Hanwha's Noh Si-hwan,
NC's Kim Ju-won,
and KIA's Kim Do-young...
In the case of Kim Ju-won, whom we have seen in the KBO,
there is a high possibility he will act as a defensive specialist rather than for his offensive power...
In the end, it's either Noh Si-hwan or Kim Do-young...
In the case of our neighbors, Japan,
Ichiro - Matsui - Ohtani - Seiya Suzuki - Murakami - Kazuma Okamoto
they have been performing brilliantly one after another.
I hope the day comes when KBO hitters step up their skills and succeed in the Majors to show everyone... ㅠㅠ