Late last week, K-pop fans on Korean Twitter started reverse-image-searching a face in a HYBE teaser video — and quickly came to the same conclusion. The previously unidentified member of HYBE’s new ABD girl group was Park Seo-yeon (박서연), the youngest of three Park sisters from Guri, Gyeonggi. The middle one, Lee Ha-eum (이하음 / Park Ji-young), is a working actress. And the oldest? TWICE leader Jihyo (박지효).
With Park Seoyeon’s debut, the Park family becomes the latest entry in one of K-pop’s most fascinating subgenres: idol siblings. From SM Entertainment dynasties to brother-sister duos to all-three-of-us-debuted families, the industry is full of bloodlines that quietly went pro. Here’s the full guide, with the latest entry first.
The news: TWICE Jihyo’s youngest sister joins HYBE’s ABD
On May 27, 2026, HYBE’s new girl-group-specialized label ABD released a brand short film on its official channels featuring its incoming rookie group. Within hours, fans had matched one of the unnamed members to a familiar face: Park Seoyeon, born 2008, sister of TWICE’s Park Jihyo.
Key facts about the debut:
- Label: ABD — short for “A Bold Dream,” a new HYBE sub-label specialized in girl-group production
- Producer: Han Sung-soo (한성수 MP) — credits include SEVENTEEN, After School, IZ*ONE, and TWS
- Debut window: Second half of 2026
- Park Seoyeon: 18-year-old trainee, born 2008, has been training quietly for years
That makes the Park family one of the most aggressively-credentialed entertainment-industry families in Korea right now: a TWICE leader on JYP’s flagship girl group, a sister actress in dramas, and the youngest about to debut under HYBE. All three Park daughters, all three working entertainers.
Watch: Jihyo’s solo “Killin’ Me Good”
While we wait for ABD’s actual debut song, here’s a reminder of the bar set by the oldest Park sister. Jihyo’s 2023 solo debut MV remains one of the cleanest TWICE-member solo launches to date — and is the natural soundtrack to today’s news cycle.
Video: JIHYO “Killin’ Me Good” Official MV — JYP Entertainment / YouTube.
K-pop’s most famous sister duos
Sister-sister K-pop pairs are the most common form of idol siblings — possibly because trainee pipelines tend to skew female, and the families that produce one K-pop daughter often produce two.
- Jessica & Krystal Jung — The original. Jessica anchored Girls’ Generation (SNSD); Krystal was the center of f(x). Both came up under SM Entertainment in the 2000s–2010s and remain the template for “K-pop sister act.”
- Lee Chaeyeon & Lee Chaeryeong — Chaeyeon was a member of IZ*ONE (and later debuted solo); younger sister Chaeryeong is the main dancer of ITZY. Both came through the JYP system.
- BIBI & NaKyoung (tripleS) — Soloist BIBI’s younger sister NaKyoung is a member of the 24-piece tripleS megaproject.
- Park Jihyo & Park Seoyeon (new entry, 2026) — JYP’s TWICE leader and HYBE’s incoming ABD member. Adding a “fourth-gen agency split” twist to the genre.
K-pop’s most famous brother duos
Brother-brother pairs are rarer, but the ones that exist tend to come up in the same producer/label ecosystems.
- ZICO & Woo Taewoon — ZICO is the soloist and former Block B leader who basically wrote most of late-2010s K-pop hip-hop. Older brother Woo Taewoon led SPEED before pivoting to solo work and production.
- Sungyeol (INFINITE) & Daeyeol (Golden Child) — Sungyeol was part of Woollim’s flagship boy group INFINITE; his younger brother Daeyeol later debuted as the leader of Woollim’s next group Golden Child. Same label, two generations.
Brother-sister pairs and idol families
The “brother-sister-both-idols” combo is rarer still — but the families that have pulled it off are some of K-pop’s most recognizable.
- Lee Chanhyuk & Lee Suhyun (AKMU / Akdong Musician) — Not just siblings in the industry but a literal sibling duo, performing together as AKMU on YG Entertainment since their 2014 debut. Easily the most artistically pure of any K-pop sibling act.
- The Huening family — A K-pop sibling trio: Huening Kai in TXT (HYBE), older sister Lea (former VIVA member), and younger sister Bahiyyih in Kep1er. Three idols in one family across three different agencies.
- Sandara Park & Thunder (천둥) — Dara fronted 2NE1 under YG; younger brother Thunder debuted in MBLAQ under J. Tune Camp. Both also charted as solo artists.
“With Park Seoyeon’s debut, all three Park sisters are now in entertainment. K-pop’s ‘idol family’ tradition continues.”
— Paraphrased from News1’s coverage of the story
Why “idol siblings” keep happening
The pattern isn’t random. Three things make it more likely than you’d think:
1. Visual genetics. Korean entertainment agencies famously scout aggressively, and a confirmed-photogenic family is a higher hit rate than blind tryouts. Once one sibling is in, the others get scouted (or scouted away from competing labels) almost automatically.
2. Training-system head start. Younger siblings of idols often get unofficial in-home coaching — vocal practice, dance training, how to handle a camera — before they ever sign with an agency. That’s a hidden advantage in a system where most trainees start at 12–13.
3. The labels actively spread out. The Park sisters case is illustrative: rather than both signing with JYP (the obvious move), Seoyeon went to HYBE. Labels know that “idol families” generate sustained press regardless of whether the siblings ever appear on the same stage. Spreading across companies is good for everyone.
One family, one industry
What makes the 2026 ABD reveal land harder than your typical rookie-group teaser is the family math. The Park sisters now span JYP (TWICE), HYBE (ABD), and Korean drama TV — three of the most powerful platforms in Korean entertainment, in one generation, in one family. The youngest hasn’t even released a song yet, and her debut is already the most-clicked K-pop story of the week.
If you’re watching for the broader pattern: this is K-pop’s industry maturity showing. Twenty years in, the children of the people who built the system are the ones starting to fill it. The sibling thing isn’t a trend. It’s a feature.
Sources:
News1 — 트와이스 지효 동생도 하이브 걸그룹 데뷔…가요계 자매·형제 누가 있나 (2026.05.28) ·
일간스포츠 — 트와이스 지효 동생, 하이브 새 걸그룹 데뷔한다 ·
텐아시아 — 4대 기획사 아이돌 자매 탄생하나 ·
Koreaboo — All 17 Pairs Of Siblings That Have Owned The K-Pop Industry ·
Allkpop — Meet the K-pop Idols who are Siblings ·
Wikipedia — Jihyo (singer) ·
YouTube — JIHYO “Killin’ Me Good” Official MV (JYP Entertainment)
