purist

US /ˈpjʊr.ɪst/
UK /ˈpjʊr.ɪst/
1.

순수주의자

someone who believes in and follows very traditional rules or ideas about a subject:

:
Although purists may object to split infinitives, like "to boldly go," the fact is, they are commonly used.
1.

순수주의자

believing in and following very traditional rules or ideas about a subject :

:
Dancers and listeners mostly loved the new style, but purist critics hated it.