Heirs follows a group of privileged, elite high school students as they are groomed to take over their families' business empires. These wealthy students seem to have everything under control–except their love lives. Kim Tan is heir to the Empire Group sent to study abroad in the U.S. In reality it's a form of exile, as his elder half-brother back home schemes to takes over the family business. While in the States, Kim Tan bumps into Cha Eun Sung, who's arrived from Korea in search of her older sister. He feels himself falling for her, never realizing that she's the daughter of his family's housekeeper. When his fiancée Rachel Yoo arrives to bring him back to Korea, his heart is torn between love and duty. Meanwhile, Rachel's half-brother Choi Young Do develops his own crush on Eun Sung. Who said being a rich, beautiful high school student was easy?

Yoo Hyun-Jae is a member of a popular idol group. He has a lot of fans and he is a scandal maker. Meanwhile, Lee Ji-Hoon is an aspiring singer. He pretends to be studying for his civil servant exam, but he is actually struggling to become an idol.