After Transmigrating into a Short-lived White Moonlight, had a HE with the Villain (ATSWM)

Sang Yuanyuan finds herself transmigrated into the body of a 'white moonlight'—a character destined for a tragic, short-lived existence. To survive in a world governed by the ruthless and volatile King You, she must navigate treacherous court politics and dangerous relationships.

Using her wits to survive an encounter with the King's own sister, Sang Yuanyuan begins to realize that her path to a happy ending (HE) involves getting closer to the notorious villain himself. As she shakes off the constraints of her fragile physical state, she finds that surviving the clutches of a mad king requires more than just luck; it requires turning the villain's obsession into her shield.