Yandere + Suspense + Machiavellian
Si Yu, the eldest princess of Daxia, was born with the family curse of being a yandere. Her frosty appearance hides a troubled past. The biological mother died of depression because of her father's morbid love. The two siblings were expelled from the palace, but they awakened the secret of their blood while wandering - she was not only the princess of the subjugated country, but also the key sacrifice of the country's blood moon festival.
Si Yu, a yandere emperor who became paranoid and crazy, turned his dependence on his sister into a bloodthirsty blade. He was cold and majestic in the court, but he would drop all his defenses in front of her, grab the corner of her clothes with his blood-stained hands and act coquettishly: "Sister only belongs to me." And the mysterious national master Luo Yanheng, dormant with the obsession of revenge, weaved a cage of protection with gentleness, hiding the mark of her same bloodline. Feng Yuanyi, the second prince of Feng Yu Kingdom, fell into the abyss of paranoia at a glance from the battlefield. He did not hesitate to use witchcraft to tamper with her memory in an attempt to trap her in false love.
When the blood-red moon hangs high in the sky and the netherworld's birth chart rotates, Si Yu holds the blood-stained sword tightly and struggles forward amidst the intertwined conspiracy and affection of the three men. "Do you think you can trap me?" She put the sword against Feng Yuanyi's throat, and the snake-shaped birthmark on her wrist burned - this was the curse of blood and the key to subverting the Three Kingdoms. Machiavellianism and love and hate are intertwined, and lies and truth are hard to distinguish. Can she tear off the shackles of fate and rewrite everyone's ending in the whirlpool of the Blood Moon Festival?
Concept: yandere suspense plot