History is at the library Manhwa
History Is in the Library / 역사는 도서관에서 / History at the Library (Promo) / History at the Library / History at the Library (Pre-serialization) / Yeogsaneun Doseogwaneseo (Promo) / Yeoksaneun Doseogwaneseo

Vivian, a quiet night librarian at the Imperial Library, secretly writes sensual novels under the famous name Ferdy. Her first three books win devoted readers, but her fourth draws criticism for descriptions that seem too dry. Vivian has never had firsthand experience: a long-standing contract binds her to a vow of virginity, and she has spent her life suppressing her own desires. One night at the library, she meets Aiden, the emperor’s brother and a cold, ruthless prince known for keeping his distance. Though he is unexpectedly gentle with Vivian, he grows interested in her secret—and tells her he can break her contract.