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

Question

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?