You know a K-pop group has made it when fans can rattle off nine names, birthdates, and solo projects without pausing. TWICE is that group—nine women who debuted in 2015 and have since become one of the most durable acts in the industry. But what happens when health issues and public scrutiny force some of them to step back? This guide walks through every member, the hiatuses they’ve taken, and the dating rumors that have followed, all grounded in official statements and verified reporting.

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Total Members: 9 · Debut Date: October 20, 2015 · Label: JYP Entertainment · Fandom Name: ONCE · Korean Members: 5 · Non-Korean Members: 4

Quick snapshot

1Member Count
2Hiatus History
  • Mina (2019 – anxiety) (ELLE)
  • Jeongyeon (2020–2021 – anxiety disorder) (ELLE)
  • Dahyun (2023–2024 – health reasons) (Kpop Profiles)
  • Chaeyoung (2023–2024 – injury/vasovagal syncope) (Kpop Profiles)
3Dating Status
  • Confirmed: Jihyo & Yun Sung Bin (Kpop Profiles)
  • Others: rumors only, not officially confirmed (Kpop Profiles)
4Nationality Overview

Eight items across two categories, one pattern: the group’s composition is stable, but its members’ health has required periodic breaks.

The table below aggregates core identifiers for the group.

Label Value
Group Name TWICE
Members 9
Debut October 20, 2015
Company JYP Entertainment
Fandom ONCE
Leader Jihyo
Oldest Member Nayeon (born Sep 22, 1995)
Youngest Member Tzuyu (born Jun 14, 1999)

Is Twice 8 or 9 members?

The Official Lineup

  • TWICE has nine members: Nayeon, Jeongyeon, Momo, Sana, Jihyo, Mina, Dahyun, Chaeyoung, Tzuyu (JYP Entertainment’s official profile)
  • All nine are listed on the group’s official website with no distinction in status (TWICE Official Profile)
  • No member has left permanently; all hiatuses are temporary (ELLE)

How Many Members Did Twice Start With?

  • The group was formed through the survival show SIXTEEN in 2015 (Wikipedia)
  • TWICE debuted with nine members on October 20, 2015 (Kpop Wiki)
  • The lineup has remained unchanged since debut (TWICE Official Profile)

Nationality of Each Member

  • Korean members: Nayeon, Jeongyeon, Jihyo, Dahyun, Chaeyoung (TWICE Official Profile)
  • Japanese members: Momo, Sana, Mina (TWICE Official Profile)
  • Taiwanese member: Tzuyu (TWICE Official Profile)
The upshot

Nine members, five nationalities, zero permanent departures. The group’s official stance is consistent: hiatuses mean rest, not replacement.

The implication: any claim that TWICE is down to eight members confuses a temporary medical pause with a permanent exit. The official record is unambiguous.

Why Did Mina Leave Twice?

Mina’s Hiatus in 2019

  • Mina went on hiatus in July 2019 due to extreme anxiety and panic attacks (ELLE magazine’s coverage)
  • JYP Entertainment announced the break at the time, stating Mina needed rest and treatment (ELLE)
  • She did not leave the group permanently; it was a temporary health-related pause (ELLE)

Return and Current Status

  • Mina returned to group activities in late 2019 and fully resumed in February 2020 (Wikipedia)
  • She has since participated in all group releases and tours (TWICE Official Profile)

What this means: Mina’s absence was the most publicized health crisis in TWICE’s history, but it was also the first that forced fans to separate “hiatus” from “departure.” The group’s cohesion survived.

What Happened to Dahyun and Chaeyoung?

Dahyun’s Hiatus

  • Dahyun went on hiatus in December 2023 due to health issues (Kpop Profiles)
  • JYP announced in February 2026 that she would miss North America tour dates due to an ankle injury (Kpop Profiles)
  • She resumed performance activities in April 2026 (Instagram announcement)

Chaeyoung’s Injury and Hiatus

  • Chaeyoung joined Dahyun on hiatus after suffering injuries, reportedly related to vasovagal syncope (Kpop Profiles)
  • Her hiatus was reported in November 2025 (Kpop Profiles)
  • Both members have since returned to full group activities (TWICE Official Profile)
What to watch

Dahyun and Chaeyoung’s overlapping hiatuses in 2023–2025 created a two-member gap that was the group’s longest combined absence since Mina’s. The pattern: TWICE’s management prioritizes recovery over schedule.

Which Twice Members Have Boyfriends or Have Dated?

Jihyo’s Relationship with Yun Sung Bin

  • Jihyo is confirmed to be dating baseball player Yun Sung Bin (Kpop Profiles)
  • JYP Entertainment acknowledged the relationship in 2024 (Kpop Profiles)
  • This is the only dating relationship officially confirmed by the agency (Kpop Profiles)

Other Dating Rumors

  • Various members have been linked to idols and celebrities, but none have been confirmed by JYP (ELLE)
  • Momo and Sana have faced dating rumors, but no official statements exist (ELLE)
  • JYP Entertainment typically does not comment on unverified reports (ELLE)

Official Statements from JYP

  • JYP confirmed Jihyo’s relationship, stating they are “getting to know each other” (Kpop Profiles)
  • No other member’s dating has been officially confirmed or denied (ELLE)

The trade-off: JYP’s selective confirmation policy protects members’ privacy but leaves fans in a gray zone where unconfirmed rumors proliferate. Only one relationship is on the record.

Who Is the Least Biased Member of Twice?

Understanding ‘Biased’ in K-Pop

  • ‘Biased’ refers to a fan’s favorite member in a group (Wikipedia)
  • The ‘least biased’ member is the one with the fewest fans naming them as their bias (Wikipedia)
  • It is a fan-driven term, not an official designation (ELLE)

Fan Polls and Statistics

  • Results vary by region, survey methodology, and time period (ELLE)
  • Some polls show Tzuyu or Chaeyoung as less biased, but no consistent pattern exists (Kpop Profiles)
  • No official data is published by JYP Entertainment (TWICE Official Profile)

Is There an Official Least Biased?

  • No member is officially designated as least biased (TWICE Official Profile)
  • The concept is subjective and fluctuates with comebacks and solo activities (ELLE)
The catch

The ‘least biased’ question is a fan poll curiosity, not a metric with any official weight. Asking it assumes a monolithic fandom, but ONCE is fragmented by region and taste.

Why this matters: the question reveals more about fan culture than about TWICE. No member is objectively less popular—only less popular in a specific poll at a specific moment.

Timeline of Key Events

  • October 2015: TWICE debuts with 9 members (Wikipedia)
  • July 2019: Mina goes on hiatus due to anxiety (ELLE)
  • Late 2019: Mina returns to group activities (Wikipedia)
  • October 2020 – 2021: Jeongyeon takes hiatus for anxiety and health (ELLE)
  • December 2023: Dahyun goes on hiatus for health reasons (Kpop Profiles)
  • January 2024: Chaeyoung joins Dahyun on hiatus due to injuries (Kpop Profiles)
  • 2024: Jihyo’s relationship with Yun Sung Bin confirmed by JYP (Kpop Profiles)
  • 2025–2026: Dahyun and Chaeyoung return to full activities (Instagram)

The pattern: eight years, four health-related hiatuses, one confirmed relationship, zero lineup changes.

Confirmed facts

  • TWICE has 9 members.
  • Mina had a hiatus in 2019 for anxiety.
  • Jeongyeon had a hiatus for anxiety.
  • Dahyun and Chaeyoung had hiatuses in 2023–2024.
  • Jihyo is dating Yun Sung Bin.

What’s unclear

  • Whether any other member is currently dating.
  • Future hiatuses or potential line-up changes.
  • The exact reasons behind some hiatuses beyond official statements.

Key Quotes from JYP Entertainment

“Mina is currently experiencing extreme anxiety and panic attacks. After discussion with the members and the company, we have decided that she should take a break.”

— JYP Entertainment, July 2019 (ELLE)

“Jeongyeon has been experiencing anxiety and insecurity about performing. She will be taking a break to focus on her health.”

— JYP Entertainment, October 2020 (ELLE)

“Jihyo and Yun Sung Bin are getting to know each other with good feelings.”

— JYP Entertainment, 2024 (Kpop Profiles)

Seven years of hiatus announcements, one consistent message: health comes first. JYP’s language is clinical, not dramatic—a deliberate choice to normalize mental health breaks.

Summary

TWICE’s nine-member lineup has remained intact through anxiety hiatuses, ankle injuries, and one confirmed relationship. The group’s durability comes from a management approach that treats health breaks as temporary, not exits. JYP Entertainment’s consistent policy of prioritizing recovery over schedule has preserved the group’s cohesion while allowing periodic gaps in live performances.

Additional sources

youtube.com, instagram.com, instagram.com, news.pollstar.com, reddit.com, broadwayworld.com

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Frequently asked questions

What is TWICE’s fandom name?

ONCE.

When did TWICE debut?

October 20, 2015.

Who is the oldest member of TWICE?

Nayeon, born September 22, 1995.

Who is the youngest member of TWICE?

Tzuyu, born June 14, 1999.

What are the birthdates of TWICE members?

Nayeon (Sep 22, 1995), Jeongyeon (Nov 1, 1996), Momo (Nov 9, 1996), Sana (Dec 29, 1996), Jihyo (Feb 1, 1997), Mina (Mar 24, 1997), Dahyun (May 28, 1998), Chaeyoung (Apr 23, 1999), Tzuyu (Jun 14, 1999).

Are all TWICE members Korean?

No. Momo, Sana, and Mina are Japanese; Tzuyu is Taiwanese.

Did any member leave TWICE permanently?

No. All hiatuses are temporary.

How many albums has TWICE released?

As of 2026, over 20 studio albums and extended plays in Korean and Japanese.