I Became a Millionaire’s daughter summary: Lee Yoori and Lee Yool were faced with an extraordinary situation after they fell from a 10-story building. When Lee Yoori regained consciousness, she discovered that she had switched bodies with Lee Yool. Excited by the prospect of living as a millionaire's daughter, Lee Yoori decides to embrace her new identity temporarily, while searching for a way to return to her own body. However, the situation becomes complicated as Lee Yool is already engaged, making it challenging for Lee Yoori to adjust to her new life unnoticed. Will she be able to adapt to this unfamiliar existence and overcome the obstacles in her path? The prologue sets the stage for the captivating story.