Kim Sejeong Biography: Age, Boyfriend, Net Worth, Height, Dramas, Songs, Real Name, Parents

Kim Se-jeong, often known simply as Sejeong, is a South Korean singer and actress whose rise to fame began in 2016 when she placed second in the survival show Produce 101. Her debut with the project girl group I.O.I introduced her to a wide audience.

From there, she joined the girl group Gugudan and later transitioned into a successful solo career while also taking on major acting roles.

Sejeong has become well-known for leading dramas such as School 2017, The Uncanny Counter, and Business Proposal, as well as for her music releases like “Flower Way.”

Profile

• Full name: Kim Se-jeong (김세정)
• Nickname: Sejeong; “God Sejeong”
• Date of birth: August 28, 1996
• Age: 29 years old
• Gender: Female
• Place of birth: Gimje, North Jeolla Province, South Korea
• Nationality: South Korean
• Profession: Singer, actress, songwriter
• Height: 164 cm (5′5″)
• Weight: 48 kg
• Eye color: Brown
• Hair color: Brown
• Parents: N/A
• Siblings: One older brother
• Spouse: None
• Children: None
• Relationship status: Single
• Religion: Non-religious
• Ethnicity: Korean
• Net worth: USD 5–8 million

Early Life and Education

Kim Se-jeong was born on August 28, 1996, in Gimje, North Jeolla Province, South Korea, and later moved to Anyang, Gyeonggi Province. Her parents divorced when she was young, and she was raised by her mother and older brother.

During parts of her childhood, they lived with her aunt due to financial hardship. She reconnected with her father during her middle school years.

Sejeong showed an early passion for singing and participated in several youth talent contests. For her education, she studied Practical Music at Hanyang Women’s University, where she honed her vocal and performance skills before fully entering the entertainment industry.

Personal Life

Much of Kim Se-jeong’s private life remains discreet. She has no confirmed spouse or children. Though she has been the subject of dating rumors with some co-stars, including Business Proposal actor Ahn Hyo-seop, she has publicly clarified that she is not dating anyone as of 2025 and is currently focused on her music and acting career.

Sejeong identifies as non-religious, though she occasionally shares personal reflections on spirituality, gratitude, and mental health with her fans. She is known for her cheerful, humble personality and her close relationship with both fans and fellow entertainers.

Career

Kim Se-jeong first appeared on talent and audition programs such as K-Pop Star 2 and Superstar K, though she did not advance far in those early attempts.

In 2016, she gained national attention by finishing second on the survival show Produce 101, which led to her debut as a member of the project girl group I.O.I. Following I.O.I’s disbandment, she joined Gugudan, a girl group under Jellyfish Entertainment, and was also part of its sub-unit Gugudan SeMiNa.

Her solo debut came in November 2016 with the single “Flower Way,” produced by Zico of Block B. The song achieved all-kill chart success and solidified her position as both a vocalist and emotional storyteller.

Sejeong expanded into acting, earning praise for her lead role as Ra Eun-ho in School 2017, followed by key performances in I Wanna Hear Your Song (2019), The Uncanny Counter (2020–2023), Business Proposal (2022), and Today’s Webtoon (2022).

Her musical work includes EPs such as Plant (2020) and I’m (2021), as well as her first full-length studio album Door (2023). She has also contributed to drama soundtracks and performed across Asia in fan meetings and mini-concert tours.

In addition to entertainment, Sejeong has served as an ambassador and model for brands like Dior Beauty, Calvin Klein, and Banila Co, and she frequently appears on Korean variety shows.

Awards and Nominations

• APAN Star Awards 2022 — Excellence Award, Actress in a Miniseries for Business Proposal (nominated)
• APAN Star Awards 2022 — Best Couple (with Ahn Hyo-seop) for Business Proposal (nominated)
• Asia Artist Awards 2017 — Popularity Award (nominated)
• Asia Artist Awards 2022 — DCM Popularity Award (Actress) – Won
• Asia Artist Awards 2022 — Best Actor Award (Female) – Won
• Asia Artist Awards 2023 — Popularity Award (Actress) – Won
• Asia Artist Awards 2023 — Best Actor Award (Female) – Won
• Baeksang Arts Awards 2018 — Best New Actress (Television) for School 2017 (nominated)

Net Worth

Kim Se-jeong’s estimated net worth ranges between USD 5 million and USD 8 million. Her wealth primarily comes from: acting roles in major television dramas (Business Proposal, The Uncanny Counter), music releases and live performances, endorsements and brand ambassadorships (Dior Beauty, Calvin Klein, Banila Co).

Social Media

• Instagram: @clean_0828
• Twitter (X): @official_kimsejeong
• TikTok: @sejeong_official
• YouTube: 세정 SEJEONG

Filmography

• School 2017 (2017)
• I Wanna Hear Your Song (2019)
• The Uncanny Counter (2020–2023)
• Business Proposal (2022)
• Today’s Webtoon (2022)

Discography

• Flower Way (2016)
• If Only (2017)
• Lover (2018)
• Plant (2020)
• Whale (2020)
• Warning (2021)
• Let’s Go Home (2021)
• Voyage (2021)
• Top or Cliff (2023)
• Indigo Promise (2023)