Seo Young-eun’s health-related absence from Kep1er has ended in an official lineup change. WAKEONE and KLAP Entertainment announced on March 6, 2026, that Seo Young-eun had wrapped up her activities with the group, following a hiatus that began in July 2025 because of health issues.1
The development places the search phrase “Youngeun Leaves Kep1er” in a health-focused timeline rather than a sudden personnel shift. Source records show the decision followed months of suspended activities, missed comeback promotions, and agency discussions about her future direction with the group.2
Health Hiatus Became the Central Context

Seo Young-eun temporarily halted Kep1er activities in July 2025 after health concerns were made public through agency notices. Soompi reported on July 15, 2025, that KLAP announced Youngeun would pause activities because of health issues after a medical examination found she needed sufficient rest and recovery. The notice also confirmed that she would not join Kep1er’s August comeback activities.3
Korean reports published on March 6, 2026, repeated that health condition context when covering her departure. SBS Entertainment News reported that she had been on hiatus since July 2025 because of health issues, after medical advice that she needed sufficient rest and stability.1
The Fact, carried through Daum, also stated that Seo Young-eun had stopped activities in July 2025 due to health problems and did not participate in the group’s August comeback activities.4 Sports Chosun described the March 2026 departure as being formalized about eight months after her activities were suspended, adding that she was unable to participate in comeback activities and a concert tour during that period.2
The agencies’ March announcement did not present the departure as an isolated event. Sports Chosun reported that WAKEONE and KLAP Entertainment said they reached the decision after discussing Seo Young-eun’s future activity direction over a long period. The official wording cited in the report stated that the decision came after “careful discussion.”2
Confirmed Timeline and Group Status
The official update on March 6, 2026, confirmed two main points: Seo Young-eun’s activities with Kep1er had ended, and Kep1er would continue as a six-member group. Soompi’s March 6 report also stated that WAKEONE and KLAP Entertainment released an official statement announcing Youngeun’s departure from Kep1er and noted that the decision followed her July 2025 health-related hiatus.5
| Date | Confirmed development | Source-backed detail |
|---|---|---|
| July 15, 2025 | Health hiatus announced | KLAP said Youngeun would temporarily halt activities because of health issues and needed rest and recovery.3 |
| August 2025 | Comeback activities missed | The July notice confirmed she would not join Kep1er’s August comeback activities.3 |
| March 6, 2026 | Departure officialized | WAKEONE and KLAP Entertainment announced that Seo Young-eun had wrapped up activities with Kep1er.1 |
| March 6, 2026 | Kep1er continues as six | The agencies said Kep1er would continue activities as a six-member group.1 |
| March 7, 2026 | Personal statement reported | Seo Young-eun shared thoughts on Instagram, saying her time with Kep1er and Kep1ian was precious.6 |
The remaining Kep1er lineup identified in the SBS report consists of Choi Yu-jin, Xiaoting, Kim Chae-hyun, Kim Da-yeon, Hikaru and Huening Bahiyyih.1 This six-member continuation was also reported by Soompi and The Fact, which both cited the agencies’ official position that the group would proceed in that format.45
The key agency statement quoted by SBS said, “Kep1er will continue activities as a six-member group.”1 The Fact reported another direct agency line: “Seo Young-eun will wrap up team activities.”4 Together, those official statements define the current structure: Seo Young-eun is no longer participating in Kep1er team activities, while the group continues without adding a replacement in the available source material.
After the Announcement
Reports after the official agency announcement added Seo Young-eun’s own response. News1, republished by Donga Ilbo, reported that she shared her feelings on Instagram on March 7, 2026. The article stated that although she was ending team activities, she described her time with Kep1er and the fandom Kep1ian as precious.6
That March 7 post was reported after the agencies had already confirmed the departure and the six-member continuation on March 6. The available source material does not provide a new agency schedule, a solo activity plan, or a detailed medical update beyond the previously stated need for rest, recovery, and stability.
The sources also do not indicate that Kep1er’s name, management structure, or remaining member lineup changed beyond Seo Young-eun’s departure. The confirmed group status is limited to the six members named in SBS Entertainment News: Choi Yu-jin, Xiaoting, Kim Chae-hyun, Kim Da-yeon, Hikaru and Huening Bahiyyih.1

Seo Young-eun’s exit from Kep1er was officially confirmed on March 6, 2026, after a health-related hiatus that began in July 2025 and affected comeback and tour participation. Based on the available agency-backed reports, the health gap is the central context for the lineup change, and Kep1er is continuing activities as a six-member group.
References
- Seo Young-eun Leaves Kep1er After 4 Years, Group Continues as 6 (SBS Entertainment News, 2026-03-06)
- [공식] 케플러 서영은 결국 탈퇴…활동 중단 8개월 만에 팀 떠난다 (스포츠조선, 2026-03-06)
- Kep1er's Youngeun To Take Hiatus Due To Health + Sit Out Of Upcoming Comeback (Soompi, 2025-07-15)
- 케플러, '활동 중단' 서영은 탈퇴→6인 체제 활동 (더팩트(다음), 2026-03-06)
- Kep1er Announces Youngeun’s Departure From Group (Soompi, 2026-03-06)
- 서영은, 케플러 탈퇴 심경 “모든 기억 꿈만 같아…멋진 새 챕터 준비” (뉴스1/동아일보, 2026-03-08)