Is it okay to work as a foreign teacher in South Korea?

Hello, I recently received a job offer as a homeroom teacher in Korea. I graduated from university this month and have had several experiences with overseas teaching internships. The conditions of the offer are as follows: - Working hours: 9 AM to 6 PM, with classes starting at 9:30 AM - Salary: 2.8 million won - Provision of a modern apartment - Holidays off - 11 days of vacation, 1 day of sick leave - 1-hour lunch break - Number of students: 3 - Located in a new city, not as big as Seoul - Special events every Friday - A few other native teachers are also working there These conditions seem really good, so I accepted the offer. Is this offer really okay? And how should I go about the visa application process and preparing apostille documents?