Marvel 퍼니셔 is the official Korean title. See this previous content issue report.

Nope. Check out https://youtu.be/SRrPU7_TiDw (netflix KOREA official youtube)

And https://media.netflix.com/ko/only-on-netflix/167354

The alternative title is already added as an alternative.

You mean, Netflix KOREA media center is wrong?

You mean, "마블 제시카 존스" change to "Marvel 제시카 존스"? https://www.themoviedb.org/tv/38472-marvel-s-jessica-jones?language=ko-KR You mean, "캡틴 마블" change to "캡틴 Marvel"? https://www.themoviedb.org/movie/299537-captain-marvel?language=ko-KR You mean, "어벤져스: 엔드게임" change to "Marvel 어벤져스: ENDGAME"? https://www.themoviedb.org/movie/299534-avengers-endgame?language=ko-KR

You mean, Netflix KOREA media center is wrong?

Looks like it. Netflix is (obviously) the best source for Netflix content.

You mean, "마블 제시카 존스" change to "Marvel 제시카 존스"? https://www.themoviedb.org/tv/38472-marvel-s-jessica-jones?language=ko-KR

No, the official title is 마블 제시카 존스 as per Netflix.

You mean, "캡틴 마블" change to "캡틴 Marvel"? https://www.themoviedb.org/movie/299537-captain-marvel?language=ko-KR You mean, "어벤져스: 엔드게임" change to "Marvel 어벤져스: ENDGAME"? https://www.themoviedb.org/movie/299534-avengers-endgame?language=ko-KR

We only use the official titles.

??

https://media.netflix.com/ko/only-on-netflix/167354