The previous Super Sentai Series, Mashin Sentai Kiramager hasn't aired in Korea yet. The last Super Sentai that aired in Korea was Kaitou Sentai Lupinranger vs. Keisatsu Sentai Patranger, which went under the name Power Rangers Lupin Force vs. Patrol Force, which was originally skipped in favor of Kishiryu Sentai Ryusoulger, which aired in Korea as Power Rangers Dino Soul.
South Korea has been airing Super Sentai under the name Power Rangers since 2004 starting with Bakuryuu Sentai Abaranger, which aired in Korea under the name Power Rangers Dino Thunder. For the uninitiated, they just basically dubbed Super Sentai in Korean, not hire Korean actors to replace the Japanese actors on-screen.
[via Rangerboard]