Salary

Hi guys, I just did my first month of work under E7. I work in the marketing industry in a very small company and I get 2,5 and without taxes it is 2,3. I know this visa is normally under a certain % of the GNI which is currently 2,8, I did call the immigration to be sure and they said if they agreed to give me the visa then it’s ok. I have no idea of the general salary in Korea and I’m thinking I am too underpaid does anyone knows if this is an ok salary or am I totally being scammed