In an empire where women are forbidden from learning the ancient language, Luna cross-dresses as "Lou" to work as an ancient language translator. Sure, her actions are punishable by death, but what haunts her more are the depressing details of her future self's diary from the mysterious library in her dreams. Making money as a translator is the fastest way she can leave her uncaring uncle's house and change her dismal future.

However, Luna's main client happens to be her cousin's fiance, Duke Rothenbern, who gets drugged with a potent love potion and needs her "assistance" detoxifying it...

Original Novel:
R15: Kakao, Naver Series
R19: RIDI, KakaoPage

Original Webtoon:
R15: Daum, KakaoPage
R19: Daum, KakaoPage

Official Translations:
R19: English*, French, German, Thai
R15: S.Chinese, French, German

*Note: The novel originally released as R15, after its web completion, it was released as R19.
Tappytoon has the R19 version but for western rating the korean R19 is considered a R17 hence why Tappytoon doesn't have it as Mature.