The Exiled Villainess

Alessia Von Hasen was exiled for trying to kill the prince's current fiancée, the protagonist of that fantasy and love story. Everyone accuses her of attempting against the life of the innocent young woman due to her jealousy, since before, the prince was her fiancé, and he abandoned her after meeting that young woman of noble heart, but, nothing is close to reality. Alessia is actually a reincarnated and, unlike the real one, who was judged as a villain jealous of the woman who stole her fiancé's love.
This Alessia accepts exile with pride, so she can live peacefully in the northern lands. And so it was until the protagonist's ex-fiancé, Ritter Escalante, crosses her path and after a passionate night together, both must ally in a fight against the demon king, who seeks to eliminate both. Why does the demon king want them dead?Can these old rivals work together to save their lives?