Как по Английски будет 끝까지 버티는

noun

A person who strongly opposes change or who continues to support something in spite of opposition.

Примеры использования:

A diehard yankees fan

adjective

Unwilling to change or give up your ideas or ways of behaving, even when there are good reasons to do so

Примеры использования:

A diehard conservative

idiom

If a belief or way of behaving dies hard, it takes a long time to disappear, and is not given up easily

Примеры использования:

Old habits die hard.