High school student Cha Eun-sang (Park Shin-hye) is a part-time worker. She lives with her single mother and lives a bleak life. She is an out-and-out "poor heir". Kim Tan (Lee Min-ho) is the heir to Korea's leading conglomerate Empire Group. He is handsome and has a distinguished family background. He has everything by birth. However, he is an illegitimate child and is regarded as a thorn in the eye by his half-brother. He is "exiled" to the United States to study. In order to find her sister, Eun-sang came to the United States alone and found that her sister's glamorous life was all lies. When her dream collapsed, Eun-sang unexpectedly met Kim Tan. After experiencing the ridiculous incident, Kim Tan took the homeless Eun-sang home. Then Kim Tan's fiancee came to the door, and since then, Cinderella has had a bad relationship with the princes and princesses. The gears of fate continue to turn, and Eun-sang and Kim Tan's encounter did not end in the United States. After returning to South Korea, Eun-sang transferred to the Imperial High School where many rich kids gathered. Choi Young-do, a smart bad boy, Lee Bo-na, a chaebol daughter, these enviable 18-year-old heirs appeared one by one.