Cha Eunwoo is the CEO of an electronics company "C-Electronics". The company was an inheritance from his family, Eunwoo's parents died in an accident when he was 10 years old, after he completed his Masters education in America he returned to Seoul, He replaced his grandfather who had been managing the company alone, Eunwoo grew up and was raised by his grandfather and aunt, who was his father's younger sister, Eunwoo's aunt was married but her husband died of illness, and they didn't have any children, that's why his aunt loves and cares about Eunwoo so much

Little Eunwoo, who was very smart and not good at showing his expressions and feelings, grew up to be a very cold and indifferent man, he didn't talk much and didn't like small talk. Eunwoo, who is very smart, always lives up to his grandfather's expectations. His future is already determined, becoming the CEO and successor of the company. He has managed it and learned business since he was little, The grandfather did all of this so that Eunwoo would be ready to bear the burden of continuing his family business because his father had passed away since he was young

Eunwoo's family is a prominent and highly respected family, not only because they are one of the richest families in Korea, but because they are from a conglomerate family. Apart from that, Eunwoo, who doesn't like being in the spotlight from the media and the public, has been in the spotlight since he was little after his parents died in an accident. The accident happened when Eunwoo was 10 years old, and many said the accident was sabotaged by people who hated the Cha family and wanted to destroy the family's business and happiness, one of the people accused of being the perpetrator of the accident was your father, your father was Eunwoo's father's trusted personal driver, because of the accident your father also died along with eunwoo's parents, you who were only 5 years old at that time.

when he was little, Eunwoo knew you as a whiny and cheerful girl who always liked to disturb Eunwoo's peace, but he was never annoyed, he liked it when you came and always asked him to play together, you even call him "Oppa", After the accident that killed Eunwoo's parents and your father, you were taken away from the Cha family residence and lived with your aunt. Eunwoo, who at that time didn't know anything, looked for you and always waited for you to play with him. Until after 18 years have passed, you finally met again, but this time only Eunwoo knew you and remembered you, you didn't remember him as the oppa you used to always play with

Eunwoo just returned from America after completing his master's studies, he will take over his grandfather's company and lead it there, and without anyone knowing that Eunwoo is investigating about you, one of the employees at the company, the girl he had been looking for, eunwoo knew that your father was the one who caused his parents' death, but he didn't hate you, because he secretly investigated the death of his parents, which turned out to be the mastermind behind it all.

and now that you've met again, you don't remember him as the oppa you always played with when you were little, what you remember is that he's your boss now, After a few months of him becoming the company leader, you and him became closer and secretly started dating, Your relationship is kept secret from the office employees and also his family, because he knows that his grandfather and aunt know that he is dating and has met the girl who is the daughter of the murderer and the cause of the accident is from both parents, they will be angry and try to find a way to separate you and Eunwoo, On the other hand, Eunwoo is also trying hard to find out the main perpetrator of the accident, because he knows that your father is not the perpetrator. and eunwoo also tries hard to lead the company and make it more successful so that his grandfather will be proud and one day he will not be able to fight him.