Our Unwritten Seoul () is a 2025 South Korean television series starring Park Bo-young, Park Jin-young, and Ryu Kyung-soo. It aired on tvN from May 24, to June 29, 2025, every Saturday and Sunday at 21:20 (KST). It is available for streaming on Netflix.
Synopsis.
The series revolves around Yoo Mi-ji and Yoo Mi-rae, identical twin sisters of opposite personalities who swap their lives for some reasons and lead entirely different lives through a lie.
 A lawyer at a large law firm
 A man who started as a hedge fund CIO but later became a farm owner
 Mi-ji and Mi-rae's mother who is an elementary school lunch lady. She is a strong single mother who has been the head of her household for nearly 30 years
 Grandmother of the twins; former beauty salon owner who now helps with childcare and housework
 Kyunggu Mart assistant manager, Mi-ji's ex-boyfriend and current best friend
 A high school friend of Mi-ji and Mi-rae
 Lee Ho-soo's senior colleague and a highly capable lawyer known for his impressive win rate
 Lee Ho-soo's mother and vice principal of an elementary school. She has been a long-time neighbor of Yoon Mi-ji's family in Duson-ri
 Lee Ho-soo's secretary at Wongeun Law Firm
 Director of Planning and Coordination Bureau
 Head of Planning Strategy Team
 Planning Strategy Team member
 Planning Strategy Team member
 Planning Strategy Team member
 Data analyst
 Former Planning Strategy Team member
 President of the Duson-ri Youth Association
 Seedong Market operator and Youth Association member
Production.
Development.
, who directed "Lovestruck in the City" (2020–2021), was attached to direct, and Lee Kang of "Youth of May" (2021) was reported to write the screenplay in December 2024. The series was planned by Studio Dragon and co-produced by Monster Union, , and Next Scene. Screenwriter Kang shared that she wrote the series to tell "stories of people who look fine on the outside but are already wavering and exhausted inside." She imagined how nice it would be if a person who looked exactly like her could replace her, but at the same time wondered if her twin's life would be more peaceful than hers, thus deciding to write about two twin sisters swapping lives.
Casting.
On July 25, 2024, "Newsen" reported that Park Bo-young had received an offer for the series, with "Ten Asia" confirming her appearance on the same day. On September 26, BH Entertainment told "Newsen" that Park Jin-young was considering the drama as the next project following his discharge from the army. On October 8, "News 1" reported that Ryu Kyung-soo had joined the series as one of the leads. On December 3, Park Bo-young and Jin-young were confirmed to appear.
Filming.
Principal photography began at the end of 2024.
Original soundtrack.
The soundtrack features artists such as Choi Yu-ree, 10cm, Hong Isaac, dori, and Elaine. It was led by music director Nam Hye-seung.
Singles.
Part 1
Part 2
Part 3
Part 4
Part 5
Part 6
Reception.
Viewership.
"Our Unwritten Seoul" premiered on South Korean cable television channel tvN on May 24, 2025. Its first episode recorded a viewership rating of 3.6%. This was slightly lower than the 3.7% premiere rating of its predecessor, "Resident Playbook".