Earlier quoted context omitted.
Formality and politeness is baked into Korean and you are basically always speaking at the right formality unless you ignore the rules. Your relationship to who you're speaking to (and who you are referring to if you speak about anyone else) changes the grammar of the sentence. The grammar changes mostly manifest in different suffix endings.
How do noble or formal titles work then? It seems very unlikely to just be a suffix ending.
The whole thing is a bit more complex than suffix changes alone especially with more out there titles but generally speaking,
I think you've seen a bit on how the endings would change depending on your relationship to the hearer.
For the latter(addressing people you're speaking about)
For instance, You would basically never call an acquaintance just by name
Take the name 김영철
If you were on relatively equal social standing, you would generally address 김영철 as 김영철 씨 or 영철 씨
If you wanted to take it a step further in respect, you would replace 씨 with 님
For a senior in age or experience in say the workplace, it would become 선배 but this can be used to address the person on its own without the name attached.
There are also different words for how you would address different members of the family. Unlike in English, you would basically never call an older brother or sister by their actual name. It's more a generic brother or sister word that changes depending on if the speaker is male or female.
오빠 - female referring to older brother
형 - male referring to older brother
누나 - male referring to older sister
언니 - female referring to older sister
For royalty, there'll be different titles for different members of the royalty.