On November 29, 2018, Rucinski signed a one-year, $600,000 contract with the NC Dinos of the KBO League. On January 1, 2021, Rucinski re-signed with the Dinos on a one-year, $1.6 million contract. He posted a 15–10 record with a 3.17 ERA and 177 strikeouts over 178 ⅔ innings. On December 21, 2021, Rucinski re-signed with the Dinos to a $2 million deal, which tied for the second-most lucrative contract for a foreign player at the time of his signing. He became a free agent after the 2022 season.
