As others pointed out, no single font is required to support all available Unicode characters. In fact it is just close to impossible anyway, because it is extremely hard to harmoize all typographic conventions across all scripts. Unicode mostly does the next best thing: it gives a uniform framework to handle multilingual texts without knowing specifics. Even though your font can't render "월터 브라이트" programs can normalize, compare, search and segment it just like it does with the text "Walter Bright".
But if you like a pedantry, Noto fonts are close to be complete. They have to be used as a collection due to the OpenType limitation, but otherwise designed in unison. Most remaining characters are rarer CJK unified ideographs [1] but it is more about the priority issue; there are several fonts that cover the entire CJK unified ideographs as well.
But if you like a pedantry, Noto fonts are close to be complete. They have to be used as a collection due to the OpenType limitation, but otherwise designed in unison. Most remaining characters are rarer CJK unified ideographs [1] but it is more about the priority issue; there are several fonts that cover the entire CJK unified ideographs as well.
[1] https://notofonts.github.io/overview/