The First Man (TV series)

In 1995, twin sisters Oh Jang-mi and Ma Seo-rin were born. One of them was forcibly taken by Chae Hwa-young from their birth mother, Jeong Suk-hee. The child was later brought into Chairman Ma's house, where Hwa-young claimed her as her own child with Dong-seok. Ultimately, she joined the Chairman Ma's family and fulfilled her desire to enter the Dream Group. As the twins grow up, they lead vastly different lives, one is the spirited and righteous, and the other is a spoiled heiress. One day, when the twin sisters finally meet, they later decide to switch identities to uncover the hidden truth. Ma Seo-rin, who took on Oh Jang-mi's identity, was in a coma after an accident orchestrated by Chae Hwa-young, intended for Jang-mi. Jang-mi later assumed Seo-rin's identity to gather evidence against Chae Hwa-young, to crush and bring down the evil woman. As Kang Baek-ho and Kang Jun-ho, two brothers, become entwined with Jang-mi, romance, rivalry, and secrets slowly unfold. ==Cast and characters==

Main • Hahm Eun-jung as Oh Jang-mi / Ma Seo-rin : Jang-mi's adoptive father. He grew up with Suk-hee in an orphanage. After a tragic accident happened to her, he took care of her and her child and loves them like they're his own family. • as Oh Tae-pyeong : Jang-mi's adoptive older brother and the son of Bok-gil. He loves singing and chases his dreams, but repeatedly gets scammed and loses hope. He is Baek-ho's best friend. • Jeon A-reum as Oh Tae-sook : Bok-gil's daughter, who is Tae-pyeong's older sister, and Jang-mi's adoptive sister. • Kim Ra-hee as Yeon Bo-ra : Tae-sook's daughter. Chairman Ma's family • Lee Hyo-jung as Ma Dae-chang : The chairman of the Dream Group. • Kim Young-pil as Ma Dong-seok : Jang-mi and Seo-rin's biological father, and Suk-hee's lover, who is the heir of the Dream Group, has gone missing for many years. • Lee Jae-hwang as Lee Kang-hyuk : Hwa-young's trusted secretary. • Ahn Joo-in as Yang Geom-sun : Chairman Ma's housekeeper. Baek-ho's family • Jung Chan as Kang Nam-bong : Baek-ho's father. While working on the Dream Hotel’s reconstruction, he happened to meet Chae Hwa-young and eventually started an affair with her. • as Han Young-ja : Baek-ho's mother. Hong-ju's family • as Yeom San-wol : Hong-ju's mother, who successfully seduces Chairman Ma and becomes his second wife. She is Hwa-young's elementary school classmate and her former assistant. ==Production==

Development The First Man is directed by , who previously helmed Desperate Mrs. Seonju (2024–2025), and of The Second Husband (2021–2022), and Ahn Ji-young co-wrote the screenplay. On April 24, 2026, the series was extended by 20 episodes, from 120 to 140 episodes. Casting In October 2025, Hahm Eun-jung, Oh Hyun-kyung, Yoon Sun-woo, Park Geon-il, and Kim Min-seol were officially confirmed to star. Additionally, Hahm previously led the KBS2 daily drama ''Queen's House (2025), and Kim Min-seol, a participant from Single's Inferno'' season 4, made her leading role debut in the series. The next month, it was announced that Lee Hyo-jung, Jung So-young, Jung Chan, and Lee Jae-hwang had joined the cast. ==Release==

The First Man was set to premiere on MBC TV in the second half of 2025 and air in an MBC Monday–Friday timeslot. The series was originally scheduled to premiere on December 1, 2025, but was postponed. In November 2025, a script reading was revealed, and it was officially confirmed to premiere on December 15. ==Original soundtrack==