Yeon Ju is an elite prosecutor, and her goal is to become a chief prosecutor. Therefore, she wants to investigate and catch the fraud that the deputy chief of her division failed to. Meanwhile, Mi Na is left out of her family and in-laws just like any other day and attends an art auction alone. As they are fated to, Yeon Ju sees Mi Na and gets shocked as she looks exactly like her.

When Yeon Ju wakes up at the hospital, the doctor tells her that she has retrograde amnesia due to a car accident. Yeon Ju is thrilled to find out that she is part of a wealthy family, but at the same time, she feels suffocated when she is around her in-laws. While she's feeling gloomy that no one in her family actually cares about her, she meets Seung Wook.

After Yeon Ju threw a fist towards her in-laws at the remembrance service, a rumor spreads about Yumin Group’s heiress having a psychological problem. Sung Hye takes this as an opportunity, and she holds an emergency shareholders’ meeting to impede her from getting an inheritance. Meanwhile, Hanju family gets shocked to find out the major shareholder of the Yumin group.

Yeon Ju realizes that she is involved with a gang, and she decides to hide this from Hanju family. However, when she gets arrested on suspicion of drug use, she also notices that she is extremely smart and familiar with law sections. Meanwhile, Seung Duk decides to look for Yeon Ju himself as she has been away for way too long.

With her critical thinking and analytical skills as a prosecutor, Yeon Ju does her job as the new chairman of Yumin Group smoothly even though it is her first day. And Seung Wook finds out that Yeon Ju and Mi Na's accident is not coincidental. Meanwhile, Sung Hye figures out that Mi Na took the paintings before the car accident and starts to suspect her.