Family Register (Korean: 가족관계증명서) is an ongoing South Korean melodrama family television series written by Park Ji-hyun, directed by Kim Mi-sook, and starring Park Se-young, Han Go-eun, Im Ji-eun, Sung I-eon, Park Sol-la, and Yoon Hee-seok. The series depicts the story of a woman who, from birth, is branded as the destroyer of her family, and who fights against prejudice and fate to reclaim her life. It premiered on MBC TV on July 6, 2026, and airs every Monday to Wednesday and Friday at 19:05 (KST), and every Thursday at 19:10 (KST).
Contents
Synopsis
The series follows Na Ji-ni, Na Se-ri, and Noh Young-joo as they navigate family conflict, public judgment, and personal struggles while redefining their relationships and the true meaning of family.
Cast and characters
Main
Park Se-young as Na Ji-ni
Although she grew up in a privileged household as the daughter of a famous cellist and a director, she harbors deep emotional wounds that she has not easily confided in others. Her status as an illegitimate child led to bullying and falsehoods in her youth. Do-hee, whom she had considered a friend, exposed the secret and led a bullying spree, significantly impacting Ji-ni's life. She studied Korean painting at Hankuk University, focusing on creating K-animation with international appeal.
Han Go-eun as Na Se-ri
Ji-ni's mother. A cellist who once dominated Korea's classical music scene, she is driven by ambition and prioritizes her own interests above all else. Despite achieving career success through her appearance and talent, she was stigmatized as an "adulteress". She had an affair with Cha Min-ki, a married man, and gave birth to Ji-ni. In a tearful interview, she framed the relationship as a "romance of the century" and depicted Young-ju, who refused divorce, as a malicious wife. This allowed her to recast herself from perpetrator to victim in public perception and maintain her position at the National Symphony Orchestra. Following the press conference, Se-ri and Min-ki were believed by the public to have become a legally married couple.
Im Ji-eun as Noh Young-joo
A vocal music major, she aspired to become a musical actress and developed her skills in singing and acting. Following a relationship with her university peer Cha Min-ki, she became pregnant. She discontinued her career aspirations to raise their two sons, Seung-hyun and Seung-woo, with Min-ki. Her family life ended when Min-ki began living with cellist Na Se-ri.
Sung I-eon as Lim Ji-hoo
Director of the Korea Art & Culture Center. As a child, he received little attention at home. His father was often absent for months at a time due to work at sea, and his mother provided little care. He began playing piano during a period of isolation, and it became his primary focus.
Park Sol-la as Do Do-hee
Supporting
Young-joo's family
Jeon No-min as Cha Min-ki
CEO of the production company "Cha Production" and father of Ji-ni, Seung-hyun and Seung-woo.
Seo Do-young as Cha Seung-hyun
Young-joo and Min-ki's eldest son who works as a Grade 7 postal service civil servant.
Jeong Seung-bin as Cha Seung-woo
Young-joo and Min-ki's second son and a documentary PD at a broadcasting station.
Jung So-young as Dang Ngoc Mai
Youngest daughter of the chairman of a Vietnamese quasi-chaebol family, who later became Seung-hyun's wife.
Jang Yi-jun as Cha Oh-reum
Seung-hyun and Mai's son.
Kim Dong-jun as Noh Il-dong
Young-joo's younger brother and Jung-bin's secretary and personal attendant.
Gong Sang-ah as Oh Soo-yeon
Il-dong's wife and Ji-hoo's butler.
Lim family
Um Hyo-sup as Lim Jung-bin
Ji-hoo's father, who is a two-star rear admiral in the ROK Navy.
Choi Su-rin as Kim Sun-kyung
Production
Development
The series is directed by Kim Mi-sook, who helmed The Brave Yong Su-jeong (2024), and written by Park Ji-hyun, who wrote You Are the Boss! (2013) and Person Who Gives Happiness (2016–2017). It is jointly produced by MBC C&I and Void, the production company behind the 2024 film Hidden Face.
Casting
In April 2026, Han Go-eun and Park Se-young were reportedly cast to lead the series as mother-daughter. The following month, the appearances of both actress were officially confirmed, and Im Ji-eun, Sung I-eon, Park Sol-la, Seo Do-young, and Jeon Seung-bin joined the cast.
Release
The series is scheduled to premiere on MBC TV on July 6, 2026. It will air every Monday to Wednesday and Friday at 19:05 (KST), and every Thursday at 19:10 (KST).