A South Korean visa is required for citizens of most countries to enter and stay in the country. It is important to note that a single-entry visa allows entry into South Korea only once, while a multiple-entry visa allows entry several times during the validity period.
One should apply for a visa at least 1 or 2 months before their travel date.
Both categories are being applied for South Korean visas, and you can choose between plans for single entry or multiple entries
Yes, you have to do this because your Visa will be checked on different platforms and by different officers in paperback form.