I should clarify that I know that most of this comment section probably isn't American. So that last sentence is directed at the Americans specifically
American here! I know how what Old English is and most American do as well. I don't get the obsession with Americans some Europeans have when they're school systems are no better
It could vary by state. I was born and raised in Alabama and (at least anecdotally) maybe 1 out of 5 people around here would know what Old English actually is
I don't live in Alabama so I can't say much about Alabama but where I live a good amount knows old English. Alabama also ranks 45th in Education in US rankings, so I don't think that's a good example when the US is #31 in rank.
Okay history lesson because y'all don't seem to know what "Old English" is:
1. Old English was a completely different language from Modern English, with grammatical gender, the "ch" sound like in Scottish "loch," and a bajillion noun declensions. OE was spoken in Britain until the Norman Conquest in 1066, at which point French became the dominant language on the island.
2. English as a language almost goes extinct after 1066 but was revived and reconstructed as what we now call Middle English. A bunch of French (and other foreign) words flooded the lexicon and most native English words were lost. English also lost grammatical gender and almost all of the noun declensions except the possessive -s. Spelling wasn't standardized, so if you read, like, Chaucer, you might see him spell the same word 2 different ways in the same stanza. Also the printing press is invented and English kings patronize English poets like Chaucer. The "y" in "Ye Olde Shoppe" is actually a runic letter called a thorn, and it's pronounced as "th."
3. Around 1500 (the Renaissance in England), Modern English emerges. Shakespeare spoke Early Modern English, and he wasn't the only person innovating with the language, but he was definitely the most influential. English translations of the Bible like the King James Version introduce a lot of idioms we still use today. Thou/thee/thy are still being used as informal singular 2nd-person pronouns (informal meaning you wouldn't call your social superior "thou," you'd still call them "you"), but they basically fall out of use by the 1800s. "Ye" as the object form of "you" also disappears. The long, drawn-out sentences of prose literature (Ciceronian sentences) survive well into the 1800s.
All of this is to say... the translation of this manhwa does not use Old English. It doesn't even use Shakespearean/Early Modern English. It uses fully modern English with big words and archaic-sounding sentence structure. The American school system is tragic dude........