
Isn't this Korea tho

Can you not tell the difference in the writing? This is korea sadly in Korea office workers really are treated like shit they don't even get paid for over time.

If a company doesn't have to give you notice before firing you, they should not expect notice if you're "firing" them.
It's proper work etiquette to give notice (two weeks is pretty standard, but a very hard-to-fill position can = more). I figure if they want you to do more than 2 weeks, they should have to pay you a "stay longer" bonus for inconveniencing you.
But if it's not in the employment contract, you can just resign and go.

You may get better at it by starting to pay attention to the difference between Japanese and Korean names, at least that's what's worked for me.
Korean names usually have three syllables, one for the last name and the other two for the given name, and the first syllable of the given name usually consists of at least three or four letters (Hye, Hoo, Hyeong, Hee, Seol, etc). Japanese names vary more in the number of syllables, since the last names are usually long (take for example, Satou, Minamoto, Katsuragi, etc) as well as the given names, even though most syllables in both last and given names have two letters, rarely three: (A-mi, Ta-ka-shi, Sa-ku-ra, Set- su- na).
I guess japan has different rules than america about resigning. But I quit my jobs without giving a reason. And the one time they told me they couldn't accept it I just leaned in and whispered "I am resigning because I don't want to have to sue your asses, can you accept it now?" kinda thinking she should say that.