After Transmigrating, I Became the Villain

[No System, No Transmigration Into a Book. The heroine and the villains rely on their intelligence and schemes to survive. Little romance, no melodrama.] The heroine transmigrates to rescue the leader of her people, only for him to die right from the start... Worse still, the world she transmigrated into is at war with the Netherworld Clan. But the lucky heroine is a member of the Netherworld Clan herself! Can she escape the pursuit of the entire world?