The Great Abyss Casebook

[Historical mystery + bickering enemies + woman disguised as a man + two strong leads] The chief councilor's daughter, disguised as a man x a sharp-tongued scholar. Zhang You Ning, daughter of the chief councilor, assumes the identity of the righteous-yet-evil “Thousand-Faced Gentleman,” solving cases and killing people with equal ease. Gu Yumo, the “sharp-tongued scholar,” muddles the waters, his loyalties unclear. These two seemingly unrelated people are entangled by a strange murder case and eventually become accomplices to those who defy the current order.