To South Korea as a volunteer

Hello, guys, :) I am Ivko, from Russia.

Not sure I have chosen the right forum to ask a question, but still.. I am interested in moving to South Korea for a month (or so) as a volunteer. It is not about some organisation, it is about single volunteering at a hostel where I am supposed to work for food and accommodation.

So, the question is, if I go to the country as a single volunteer (not a member of a volunteering organisation), would it be legal? Do I need a specific visa for this? Or, the usual touristic visa would be enough?

What should I say to an officer (the person who checks arriving people) at the airport in this case?

Any help or advice would be very appreciated!

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