Jung Yi-hyeon, a genius, tries to get her mother's money back from a scammer. Hong Gyung-doo, having the same motive, needs the money to save his mother's life. Yi-hyeon meets her biological father. Ten years later, she wakes up on the sidewalk and is unable to recall her past memories...

Gyung-doo looks for missing Yi-hyeon. Meanwhile, Yi-hyeon traces her steps back and tries to remember everything...

Yi-hyeon, unable to recall her past, returns to the Yega Group household, whose members believe she is putting on an act. Meanwhile, Gyung-doo continues his search for Yi-hyeon.

Gyung-doo finds Yi-hyeon but is shocked when she says she doesn't remember what happened between them.

Gyung-doo confronts Yi-hyeon once more. Gyung-doo is scammed again. Things stir up in the Yega Group household...

Yi-hyeon and Gyung-doo meet in Jeju Island. Yi-hyeon gets closer to her daughter, Hong Hae-deum, as she tries to remember her past...

Yi-hyeon and Gyung-doo look for missing Hae-deum. Gyung-doo meets, Choi Gook, Yi-hyeon's father.

Yi-hyeon's cousin, Choi Gi-tae finds out about Gyung-doo and Hae-deum. Lee Seon-young gets hired at Yega Company. Yi-hyeon begins to regain her memories.

Things get heated up as Yi-hyeon and Gyung-doo decide who Hae-deum will be staying with.

Hae-deum goes to live with Yi-hyeon but ends up missing and crying over her dad.

Yi-hyeon finds out what really happened between her and her father, Gook.

The Yega Household finds out Yi-hyeon's father, Gook, is alive. They try to take custody of Hae-deum...

Seon-young confesses to Yi-hyeon about what really went on in the past. Unable to stand the Yega Household, Yi-hyeon leaves with Hae-deum.

Gyung-doo visits Yi-hyeon after finding out she is ill. Shim Yeon-jung confronts Yi-hyeon and tells her how she truly feels about Gyung-doo...

Yi-hyeon meets Gook. He and Yi-hyeon's uncle have a talk. The truth behind Yega Company is slowly unveiled.

Yi-hyeon finds out the truth about Yega Group and how it was established. Gyung-doo faces an unexpected situation. Seon-young decides to call it quits with her husband, Gi-tae.

Yi-hyeon and Gyung-doo meet to go to Hae-deum. Yi-hyeon remembers what really happened in the past. She leaves her family once again to bring an end to it all.