Reborn as the Final Boss

Shen Mo, pierced through the heart by the Chosen One's sword, was reborn as the final BOSS he had once sworn to destroy. System mission: die at the protagonist's hands according to the script, and bring about the perfect ending. Shen Mo looked at the young Chosen One before him, then touched his newly acquired [Heaven's Gift: Villain Aura]. "The script? Let someone else play that part." He turned around and gave the protagonist equipment, taught him martial arts, and even helped him claim the harem that was supposed to be Shen Mo's. Until one day, the protagonist held a sword to his throat, tears in his eyes. "Master, why are you forcing me to kill you?" Shen Mo smiled. "Because the real final BOSS was never me."