Birth Secret Season 1

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

Gyeongdoo looks for missing Yihyeon. Meanwhile, Yihyeon traces her steps back and tries to remember everything...

Yihyeon, unable to recall her past, returns to the Yega Group household, whose members believe she is putting on an act. Meanwhile, Gyeongdoo continues his search for Yihyeon.

Gyeongdoo finds Yihyeon but is shocked when she says she doesn't remember what happened between them.

Gyeongdoo confronts Yihyeon once more. Gyeongdoo is scammed again. Things stir up in the Yega Group household...

Yihyeon and Gyeongdoo meet in Jeju Island. Yihyeon gets closer to her daughter, Hong Haedeum, as she tries to remember her past...

Yihyeon and Gyeongdoo look for missing Haedeum. Gyeongdoo meets, Choi Gook, Yihyeon's father.

Yihyeon's cousin, Choi Gitae finds out about Gyeongdoo and Haedeum. Lee Seonyoung gets hired at Yega Company. Yihyeon begins to regain her memories.

Things get heated up as Yihyeon and Gyeongdoo decide who Haedeum will be staying with.

Haedeum goes to live with Yihyeon but ends up missing and crying over her dad.

Yihyeon finds out what really happened between her and her father, Gook.

The Yega Household finds out Yihyeon's father, Gook, is alive. They try to take custody of Haedeum...

Seonyoung confesses to Yihyeon about what really went on in the past. Unable to stand the Yega Household, Yihyeon leaves with Haedeum.

Gyeongdoo visits Yihyeon after finding out she is ill. Shim Yeonjeong confronts Yihyeon and tells her how she truly feels about Gyeongdoo...

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

Yihyeon finds out the truth about Yega Group and how it was established. Gyeongdoo faces an unexpected situation. Seonyoung decides to call it quits with her husband, Gitae.

Yihyeon and Gyeongdoo meet to go to Haedeum. Yihyeon remembers what really happened in the past. She leaves her family once again to bring an end to it all.

Yihyeon is questioned by a prosecutor, but her aunt tries to keep her from telling the truth. Yihyeon's uncle, Choi Seok, goes to meet his older brother, Gook, after many years.