score:7
According to Timatic:
The following are exempt from holding a visa:
Nationals of Netherlands for a maximum of 90 days.
Additional information:
Visitors are required to hold proof of sufficient funds to cover their stay and documents required for their next destination.
Upvote:7
You do not need a Visa.
Korea's Visa Exeption program allows holders of ordinary (tourist) passports from 67 countries to visit for up to 90 days without a visa. The Netherlands is one of those. Note that the specifics vary by country.
A second list covers countries like the US for which visa-free entry is allowed for up to 30/90 days.
Both lists can be accessed from Korea's Ministry of Foreign Affairs site. The apparently official VisitKorea site confirms the same.