Upvote:1
As stated by Timatic, the database used by airlines:
Nationals of any country with a visa issued by the USA if in transit through Korea (Rep.) if: -holding confirmed onward tickets on flights departing within 30 days; when -arriving from the country that issued the visa (a visa that expired on departure from that country is accepted) and departing to a third country.
So yes, you can enter South Korea by presenting your passport and connecting flight ticket and stay for max 30 days