About

I woke up inside the romance novel I used to enjoy reading. To make matters worse, I'm in the body of 'Go Yoona,' the younger sister of Woo Seungho—the school's absolute authority and the cold heir to a chaebol family. I was just a poor student who would never have crossed paths with him, but overnight, I've become a member of a grand mansion, living under the same roof as him. 'I Became the Chaebol Senior's Sister' begins when Go Yoona, who entered the elite Korea International High School through an equal opportunity scholarship, becomes the stepsister of the school's top-ranked student, Woo Seungho, due to her mother's remarriage. The two constantly clash at home and school, but their relationship develops into a precarious romance that transcends the gap in status and position. Characters and Setting The story centers on the closed space of Korea International High School and two families bound by remarriage. In a school attended by the top 1%, Yoona is ignored by those around her because of her economic background and admission route, while Seungho stands at the apex of the school's highest rank, 'Platinum.' This disparity affects not only the two of them but also their relationships with surrounding characters. Conflict and Romance Development Initially, Seungho's coldness and Yoona's resistance primarily clash. However, as they live under one roof, they discover each other's vulnerabilities, and Seungho begins to be shaken by Yoona. Since their family relationship and the eyes of the school remain obstacles, their mutual attraction develops into a hidden tension and precarious emotion rather than a stable romance.