An invitation letter for Korean tourist visa is not a mandatory requirement. You don’t need to attach one in your application if you don’t know anyone in South Korea. Also, it is not necessary for an invitation letter to be notarized or to have it legalized by a notary public.
When my friends came here last year, I sent them a scanned invitation letter. They were all able to get a tourist visa but I think it’s mainly because they have good jobs back in the Philippines. I am sending an invitation letter again to my family that will be visiting next month.
Here’s the format of the invitation letter ~
The title is 초청장 or “Invitation Letter”. The first part is for the people one is inviting. If there are more invitees, just add the information below as needed. The second part is the details of the inviter ~ don’t forget to add your contact details including your home address and phone number. The last part is optional ~ a short note of guarantee. In the invitation I sent, I explained that my family will be staying with us and that I guarantee that they would follow immigration rules.
Don’t forget to send a copy of the first page of your passport (or your Korean spouse) along with the invitation letter. Also, if you’re inviting a family member then attach a copy of your birth certificates to show your relationship. In case you changed your name to a Korean one, get a copy of your 기본증명서 (or personal history) from the village office. This will show the change in your name to Korean.
To recap here are the things you’ll need to send when inviting ~
~ an invitation letter
~ a copy of your passport
~ a copy of your personal history if you change name
~ a copy of your birth certificate to show proof of relationship
Now the only thing for you to do is wait ~ and prepare an itinerary.