Complex sentence: He is engaged to Choi Young-joo (Park Ye-jin), who comes from a comparably wealthy and powerful family, but Jae-min and Young-joo are not in love with each other.
Split into simpler sentences: He is engaged to Choi Young-joo (Park Ye-jin), who comes from a comparably wealthy and powerful family. Both Jae-min and Young-joo are not in love with each other.