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Indonesian citizens do not benefit from visa exemptions, according to the website of the South Korean Ministry of Foreign Affairs. All non-exempt citizens must obtain a visa prior to travelling to South Korea.
In your case you'll need a Ordinary Tourist C-3-9 visa:
You can use the online e-form here to begin your application.
Upvote:-1
Based on this website:
Visa is not required for a maximum stay of 30 days if traveling as tourist.