This is a summary based on our understanding of the series.
Please also note that this summary contains spoilers.
Also known as The Inheritors.
Cha Eun-sang went to USA to hand money to her sister who turned out to be a scam. She met Kim Tan there, who provoked her.
When she went back to Korea, she became Kim Tan’s maid. They fell in love. She was transferred to Empire High, Kim Tan’s school and was bullied. She was protected by the guys who liked her – Kim Tan and Cho Young Deo. She was later asked to leave Seoul by the chairman. She left and Kim Tan became a rebel.
When she came back, the chairman disapproved of her to be with his grandson, Kim Tan, but later on accepted their relationship after he got sick.