This is review is purely based on the editor/translator's style and I'm giving it 3 stars even though it looks pretty interesting (from chapter 3)

Nice translation, no big flaws

Ian/Edward/Felix/Eredith are names appearing, so it seems like western naming will be used

Since everything is styled as western medieval fantasy it feels extremely weird and breaks my immersion in the story when "Oppa" and "Ajumma/Noona" is used by medieval peasants

Big brother / Sister / Auntie etc. would give a much better reading experience

Edit at chapter 24:

It looks very good, easily a 4.5/5 so far

but again there is some small problems with Korean sneaking in where it shouldn't be

At the age of 17, he asks an innkeeper for "gukbap" which I guess is Korean stew? the problem here is that "Noona" is apparently normally used, but other Korean words aren't which further clashes with world building... (again this is an editor/translator problem that appears due to the previous korean)

He's lived 17 years in another world without speaking Korean and with nothing to write down or reminisce about his old life, so the fact that he asks for Korean stew in a random inn is truly strange (original author problem)

I'll start with the biggest problem first

Random facts and references in the writing

As an example, when describing a personality type... instead of writing "Introvert" the author decided to write the scientific name of a personality analysis

Thinking up clickbait youtube titles for a situation... after living 18 years in a medieval world

Comparing something happening to a play made by Faker in LoL, and other random games

It seriously breaks immersion whenever that happens

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The magic system is very interesting but not executed well

I was here for a fantasy wizard, then suddenly we are introduced to a faith full of idiots and a goddess who seems to simp for the MC letting him perform miracles

MC gets a magic sword that seems to completely ignore the previously established magic system of communicating with the mysteries/spirits

Of course MC has a system that'll let him instantly increase his mastery in a field of magic / grow closer to the mysteries, yet he seems to decide he's strong enough after using it twice, and doesn't use it to get stronger even though he's been in several deadly situations

With the way magic/mystery works simply having MC be liked by certain mysteries would be better as the system adds nothing to the story other than breaking immersion

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The MC lives in his own imaginary world, and still feels like a fresh reincarnator who hasn't accepted that the world is different from his home and still keeps his previous habits of communication with others

after 18? years living in another world... 10 of those as a medieval peasant who doesn't get enough to eat... yet he still acts like he's in modern korea

He seems to have a split personality as he decides to follow the worlds tradition in one chapter even if he doesn't like it much, it's just very convenient for him to do so

A few chapters later he gets angry and refuses that same tradition for no reason without any buildup

The chapter after that he goes back to following the tradition and doesn't care at all

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On top of that he's a dense idiot concerning romance, on his way to getting a harem of the Japanese kind where nothing ever actually happens... I can't be sure at C81 of course, but I really doubt he'll get anywhere romantically with the vibe of the story

pretty bland cliche stuff

kiss to a baroness he was adventuring with

In so many Asian webnovels it seems like they portray class based societies (outside of historical ones) in a very melodramatic way. Nobles are either evil or good. They treat commoners as insects to be trampled or as subjects they should bend over backwards to protect as part of their duty as nobles. While I'm sure there are those extremes it would make more sense if the vast majority landed somewhere in the middle of said extremes. More importantly commoners (and serfs) would generally fear those in classes above them. Not simply wariness, respect, or minding their manors. Because they believe in stereotypes like nobles are evil despots. Or in the case of this story that wizards are crazy eccentrics. In both cases stemming from their understandable ignorance (no education). This story illustrates this well. Regardless of the reality of the upper classes, the lower class fear them in large part due to stereotypes.

The slight twist to the magic system is nice.

I saw one comment that there wasn't enough world building... ehhh. I mean. Yeah, there are no large infodumps, but it is slowly fleshing things out. I always think it's silly when any rando on the street can act as an exposition pez dispenser to tell the MC about the world. In a feudal society without education or even long range communication who is going to be knowledgeable enough? Even Noble's knowledge will be focused on their domain and local politics. Only those in center powerbase of a kingdom or those at the borders might have a larger view of the world. Wizards? They're chasing the truth of magic. They only do/learn the bare minimum in order to chase that (well the scholars like MC's master).

The difference is the world building isn't being spoonfed. Mostly showing for once. They've already setup that the MC is later going to join one of the wizard council meetings so we'll see more of the wizard society.

Saw a complaint that the MC used a Korean word for a dish. I don't think it's weird. If you miss your hometown/cuisine you might unconsciously use the name. The innkeeper was confused of course. Which is honestly a nice touch. Too often webnovels hand wave language issues with skills/powers/systems. Or they simply ignore it and for some reason people in the other world just understand because reasons.

MC too timid or doesn't spend time training magic ahead of time? The story time skipped over his 6-7 years of training. It's not obvious at first but it seems his master did give him some advice beyond just teaching him the magic language. Nature/Mysteries/Spirits seem to have their own will, moods, and temper. There aren't predetermined spell incantations. A wizard in this setting not only has to build a rapport with each type of mystery, they seem to have to handle matters on a case by case basis. During an escape scene the MC easily raises the ground with earth magic to trip someone, but later the Earth mystery is in a bad mood and doesn't listen when he asks for a favor. This implies that even the elemental mysteries are individuals like the spirits in other works. The point is that there doesn't seem to be a fast way to train this sort of thing. In fact for most Wizards it takes years of training and it's already established that most wizards focus on a specialty. The MC is the weird one for being able to pick things up so quickly (in part due to his system). So it doesn't seem that weird for his master to send him out on a rite of passage to learn on his own. I mean this is the woman that threw him into a campfire so he could learn fire magic.

Sexism, Honestly there is a band of mercs that act like bandits... which I think the story even mentions aren't very different in practice. They both kill for a living. Only difference being one does 'honest' work and the other steals. So yeah they think with their third leg and they target a woman traveling alone. Which is strange in this setting. Only made worse because the other woman in the party is plying her trade. Its shity, and I don't think the story does anything to glorify this behavior (from what I've seen). I mean most of them get eaten by a monster before they could do anything? Instant karma? The thing about women over 30 I think was in reference to the MC's master? She freaks out about the MC's sister calling her an aunt? And I think it would be a real concern in a medieval setting without doctors or healthcare? And the girl who liked h**ny stares was a prostitute wanting to marry up in life so she didn't have to sell herself? You could call it gold digging but in this setting its more about the way she chose to survive? I think this story focuses more on class and power. It's relatively low fantasy. Not everyone is a wizard or a knight. Ironically I believe the woman the mercs were targeting was a noble traveling incognito for reasons. But that means little without personal ability or escorts.