After Rong Sijin was bound to the system, her physique changed, specifically attracting the villain alpha.
They are sinister, paranoid, violent, evil, and yandere... The only thing they have in common is that they are all addicted to Rong Sijin's pheromones.
System prompt: If the host does not save the villain alpha, there will be only death.
At first, I cried and didn't want to get close to the villain boss, but then... Huh? The villain alpha is so sweet!
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Concept: The heroine is a heartthrob.