Jo Yeon-Joo is an elite prosecutor renowned for her unmatched skills in corruption investigations at the Supreme Prosecutor’s Office. However, after a car crash while chasing a suspect, she loses her memory and wakes up to find herself living as Kang Mi-Na, the daughter-in-law of the conglomerate Hanju Group. Mi-Na, once known for her rebellious nature and as the illegitimate child of the family, is now replaced by Yeon-Joo, whose presence complicates everything. Despite the luxury of her life, Yeon-Joo’s rough, outspoken nature cannot be easily hidden in this new persona. As Yeon-Joo tries to regain her memories, she crosses paths with Han Seung-Wook, the son of a chaebol family, who has never been able to move on from his first love, Mi-Na. As Seung-Wook delves deeper into the mystery of his father's death, he becomes tangled with Yeon-Joo, further blurring the lines between who she was and who she is becoming.