Lady in Mystery is a Yuri mystery visual novel set in 18th-century Korea, where disguise, love, and truth intertwine beneath the strict Confucian order. Once an ordinary noble girl, Heesoo lost everything when her family was executed under false charges. Disguised as a man, she escapes to the capital and opens an information shop called Jeonghuso, gathering whispers and solving cases to survive. Five years later, just as she begins to rebuild her life, a runaway noblewoman named Juhee appears— and Heesoo’s carefully constructed world begins to crack.