This was the case when I had a D2 student visa and wanted to change to a D8 investment visa.
You must not operate until all visas have been changed to D8 visas.
However, in general, immigration only gives attention and changes visa.
However, it is particularly strict if you already have a visa for a specific purpose in Korea, such as a D2 visa.
In the case of this customer, I paid special attention and told me not to engage in business activities, but the investor forgot about it for a while and started the business.
I learned it at the immigration and finally went through an inspection.
A fine was imposed after going through an inspection.
In general, if a fine is imposed, it can be considered that visa change is not possible, but it depends on the amount and content of the fine.
In this case, the period was very short, it was a one-time, and I accompanied him to explain to him when he was inspected, so the amount of penalty was greatly reduced.
Still, it took longer than expected. In general, it takes about 3 weeks to get a visa, but in this case it took about 5 weeks to get permission.