The Heirs (2013) with English Subbed $Trainer-1$

The series follows a group of rich, privileged, and 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 (Lee Min-ho) is a handsome and wealthy heir to a large Korean conglomerate who is sent to study abroad in the U.S. But in reality, it's a form of exile, as his elder half-brother back home, Kim Won (Choi Jin-hyuk) schemes to take over the family business.While in the States, Kim Tan bumps into Cha Eun-sang (Park Shin-hye), who has arrived from Korea in search of her older sister who claims that she is in need of money for her wedding. When Kim Tan's fiancée, Rachel Yoo (Kim Ji-won), arrives to bring him back to Korea, his heart is torn between love and duty. Both Eun-sang and Kim Tan return to Korea. Slowly, he finds himself falling for her, later realizing that she's the daughter of his family's mute housekeeper. Meanwhile, Rachel's future stepbrother and Kim Tan's former best friend, Choi Young-do (Kim Woo-bin) (who also go to the same school as Kim Tan and Eun-sang) starts falling for Eun-sang as well. Troubles arise as the heirs realize the differences between money and the real world and they soon learn what love is.

Lee Min-ho as Kim Tan (김탄)
Jung Chan-woo as young Kim Tan (middle school student)

He is the future heir to the Jeguk (meaning "Empire") Group. Though hot-headed and at times immature, Kim Tan is warm-hearted and honest. He does not have a good relationship with his father and half-brother, the latter from whom he constantly seeks friendship (but who doesn't gives him any). He is actually the son of his father's mistress, but is listed in the family registry as the son of his father's second wife in order to be a legitimate heir. Prior to returning to Korea, he was exiled by his brother to study abroad in the U.S. Although he is engaged to Rachel Yoo, he is attracted to Cha Eun-sang at first sight and falls in love with her despite her poor background.

Park Shin-hye as Cha Eun-sang (차은상)

Down-to-earth and somewhat cynical, she diligently works part-time jobs to support herself and her mother, and gets caught in a love triangle between Kim Tan and Choi Young-do. She lives in Kim Tan's home, since her mother is a live-in housekeeper. She grew up with Yoon Chan-young, her best friend, and is enrolled in Jeguk High School on a welfare scholarship. Kim Tan comes into her life and won't stop pursuing her, but though she does reciprocate his feelings, many are bent on splitting them up.

Kim Woo-bin as Choi Young-do (최영도)
Yang Hyun-mo as young Young-do (middle school student)

The heir to the Zeus Hotel Group. He has an IQ of 150, but does not put any effort into his schoolwork. Due to this, he ranks 98th out of 100 in his class during the first Jeguk High School finals. Known for his cunning intellect and volatile manners, he is feared by his classmates, whom he bullies. His father, Choi Dong-wook is mercilessly strict and physically abusive towards him, and engages with him in judo matches to get him to do things. As part of his training as the next CEO of Zeus Hotel, Young-do is often seen washing dishes at the hotel, something he's been doing since he was in middle school.[28] Though former best friends with Kim Tan, the two now have a mutual hatred for each other, which was partly brought about by the departure of Young-do's beloved mother. Young-do begins picking on Eun-sang to irritate Tan but he soon realizes that's not the only reason she's always on his mind.