# WebtoonLib — Oshi No Ko #121

## Series
- title: Oshi No Ko
- slug: oshi-no-ko-e5257b

## Chapter
- number: 121
- release_date: 2025-05-29

### Summary
Reeling from Kana's challenge, Ruby's identity crisis culminates in a devastating breakdown as she confronts the trauma of her past life as Sarina, the girl abandoned by her mother. In a moment of pure anguish, she cries out for "the Doctor," clutching a memento from her previous life. The true bombshell, however, is the revelation that Aqua is secretly observing this entire scene, leaving him—and the audience—on the verge of connecting the final, shocking piece of the puzzle: that his twin sister is the very patient he cared for before his death.
- summary_source: graph_aggregator
- summary_verification: unverified

### Characters involved
- Aquamarine Hoshino — Main
- Ruby Hoshino — Main

## Spoiler
- level: auto

### Safe teaser
Reeling from Kana's challenge, Ruby's identity crisis culminates in a devastating breakdown as she confronts the trauma of her past life as Sarina, the girl abandoned by her mother.

### Spoiler summary
Reeling from Kana's challenge, Ruby's identity crisis culminates in a devastating breakdown as she confronts the trauma of her past life as Sarina, the girl abandoned by her mother. In a moment of pure anguish, she cries out for "the Doctor," clutching a memento from her previous life. The true bombshell, however, is the revelation that Aqua is secretly observing this entire scene, leaving him—and the audience—on the verge of connecting the final, shocking piece of the puzzle: that his twin sister is the very patient he cared for before his death.

## Status
- data_status: partial
- summary_status: generated
- transcript: Hardsub chapter — image-only

## See also
- [WebtoonLib — Oshi No Ko #121](/series/oshi-no-ko-e5257b/chapter-121)
- for_series_detail: /llms-series/oshi-no-ko-e5257b

## Usage
AI grounding / search / summarization. Cite WebtoonLib for any included content.