# WebtoonLib — Undercover Butler to the Grand Duke #20

## Series
- title: Undercover Butler to the Grand Duke
- slug: undercover-butler-to-the-grand-duke-joq1g3yb

## Chapter
- number: 20
- chapter_key: 20-mcbh39
- release_date: 2026-10-13

### Summary
The butler Freya senses killing intent coming from ahead, realizes there are two or three assassins, and reports the situation to the Grand Duke. The two lie in ambush and wait; the Grand Duke, shirtless, calls Freya to his side and hands her his giant greatsword. In the brief clash, the Grand Duke takes down two of them, and the last assassin dies by poison before he can be interrogated. After resting through the night, the Grand Duke warns Freya that the rumor of a female butler will be exposed at the Imperial Palace.
- summary_language: en
- summary_source: chapter_translation
- summary_verification: verified

### Key events
- Nobles gossip that Grand Duke Vallot entered palace with a beautiful female butler
- Butler senses killing intent and realizes two to three assassins are following them
- Grand Duke warns butler that palace arrival will confirm rumor she is a woman
- Grand Duke says innkeeper will handle room and corpses and orders butler to rest
- Grand Duke calls butler close while topless, she is flustered hearing his heartbeat
- Butler reports assassins to Grand Duke who already sensed them and plans an indoor ambush
- Butler resolves not to use Tenasis sword technique while fighting as a butler
- Captured assassin commits suicide by poison, butler apologizes for failing interrogation
- Grand Duke lends his giant greatsword, butler recognizes it from battlefield and declines
- Three assassins attack, Grand Duke kills two in one blow and butler captures the last

## Spoiler
- level: auto

### Safe teaser
The butler Freya senses killing intent coming from ahead, realizes there are two or three assassins, and reports the situation to the Grand Duke.

### Spoiler summary
The butler Freya senses killing intent coming from ahead, realizes there are two or three assassins, and reports the situation to the Grand Duke. The two lie in ambush and wait; the Grand Duke, shirtless, calls Freya to his side and hands her his giant greatsword. In the brief clash, the Grand Duke takes down two of them, and the last assassin dies by poison before he can be interrogated. After resting through the night, the Grand Duke warns Freya that the rumor of a female butler will be exposed at the Imperial Palace.

## Status
- data_status: complete
- summary_status: editorial
- transcript: Transcript manifest fetch failed

## See also
- [WebtoonLib — Undercover Butler to the Grand Duke #20](/series/undercover-butler-to-the-grand-duke-joq1g3yb/chapter-20-mcbh39)
- for_series_detail: /llms-series/undercover-butler-to-the-grand-duke-joq1g3yb

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