What was the name of this novel?

Ye Ningxi's plot more than 10 years ago caused Xuanyuan Ningxi, the illegitimate daughter of the 12-year-old leader of the Dutch underworld organization "Red Universe" Xuanyuan Qi, to be secretly sold to a terrifying and bloody assassin training base-Rebirth Island. On this island that was isolated from the world and could be called hell, she met a man who changed her life-Xuan Siye. Xuan Siye, who was eight years older than him, was the instructor on the island. He had outstanding abilities and a violent temperament. However, he only had a soft spot for Ning Xi. Finally, when Ning Xi was 16 years old, he forcefully took her in a battle. Two years later, in order to escape the control of the assassin base, the 18-year-old Ning Xi used Xuan Siye to destroy the base. After she succeeded, she stabbed him in the chest and fell into the sea in despair and grief. After that, Ning Xi left the Rebirth Island with her training partners, Yuan Xu, Teng Jun, and the others. They returned to the Netherlands to set up the Shadow Hall and restore the Xuanyuan family's glory. Unexpectedly, four years later," Red Universe " was attacked by a secret organization from Asia, and this person's methods were exactly the same as Xuan Siye's. Thus, a battle between love and hate, a contest of blood and fire, a subversion of conspiracy and trickery, and a heroic picture of redemption and destruction unfolded…