I dressed up as a man and killed my way through the tyrant experience.

From the back cover

A life-swap game lets anyone trade identities with a stranger, and a modern woman jumps in without hesitation. She wakes in a steaming marble bath as Julian, the notorious young tyrant of the ancient Empire of Veritas, whose rages empty whole families. But the swap traded only identity and place, not bodies: beneath the Emperor's robes she is still a woman, and one wrong move before the watching maids and the chief steward Bellamy means torture and death. She bluffs, roars, and decrees that she will harm no women, buying herself a single night.

At morning court she must bind her chest, hide her figure, and face Duke Silas Thorne, the all-powerful Regent and the Emperor's uncle, who demands a crushing tax rise. Using modern management logic, she counters with state-run salt and iron, a trade hub on the royal hunting grounds, a halved harem, and a cut to the Regent's own stipend. The court is stunned, and the Regent's bow hides open murderous intent.

His sister, the Empress Dowager Beatrice, answers with a feast in the Royal Gardens, where incense and soft music conceal a trap.