When do Korean people start school?

Travel Info
I'm writing a story (drawing a manga too) that happens in Korea, if any of you know on what exact date do most Korean school start (the first school day/the first day of school, for high schools in Korea to be exact), I will appreciate it very much. Thank you. :D

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September!

Others
The 'School Opening Ceremony' and the first day of classes: March 2nd. New students (first year/freshman) come a day or two later, depending on the school.
I'm a teacher in Jangan Middle/High school
High school kids go back to school on Monday, March 5th... elementary kids started on the 2nd... hope that helps....:)
I live in Korea!