How many days it takes

Regular processing takes 4 working days, you can request expedited service if you need and the visa will be ready on the next working day of application.

Hey! Thanks!
Actually they told me something about having to do it through a travel agency, that I cannot apply for the owrking visa by myself for being spanish...
That it means that I have to go to a travel agency , book the flight tickets with them and then let them handle everything with the documents I provide them?
Thanks!!!!

Yes, it is required to apply through travel agencies, even travel with South Korean passports. You can contact any of them directly if they provide visa service only without booking ticket with them.