A simple translation of keywords seems straightforward, I wonder why it's not standard.

    # def two_sum(arr: list[int], target: int) -> list[int]:
    펀크 투섬(아래이: 목록[정수], 타개트: 정수) -> 목록[정수]:
    # n = len(arr)
    ㄴ = 길이(아래이)

    # start, end = 0, n - 1
    시작, 끝 = 0, ㄴ - 1
    # while start < end:
    동안 시작 < 끝:

Code would be more compact, allowing things like more descriptive keywords e.g. AbstractVerifiedIdentityAccountFactory vs 실명인증계정생성, but we'd lose out on the nice upper/lowercase distinction.

I hear that information processing speed is nearly the same across all languages though regardless of density, so in terms of processing speed, may not make much difference.