When I was a beginner, I learned the days of the week as everyone else - 일요일, 월요일, 화요일, 수요일, 목요일, 금요일, and 토요일. But I quickly noticed something interesting, like many people; I noticed they seemed to each start with some element.
So like anyone else, I concluded that the names of the weekdays must have been based on different elements, and that was that. Right? Well, there's actually a completely different reason for this, and it has to do with the Romans and Latin.
In this video I explain how old weekday names from Latin came into Korean, and how those changed and that Korea uses those today.