Why Did the Great Emperor Take Me in During My Old Age?

[Abnormal contained object + human emperor + decisive killing + no system + invincibility + multiple female protagonists? He was once the unparalleled emperor who ended the dark turmoil in the Fallen Age, fighting bloody battles across the heavens and pushing back against unknown sources! But he also paid a heavy price for it. His old age is ominous, his body is covered with red hair, and his heart is stained with dust. In order to avoid harming the common people, he resolutely sealed himself and slept in the amber of the sacred mine for eternity. Countless years later, the modern city has revived its aura. The mysterious organization "Abnormal Asylum" controls countless weird and dangerous "anomalies". A piece of amber sealed with a red-haired humanoid creature, numbered YC-D13, and rated as the highest risk (Keter level). The amber trembled, and the Eternal Emperor's eyes suddenly opened! The red hair is fluttering, and the imperial posture reappears. Chen Shi, the ancient emperor, broke out of the seal and stepped into this bizarre modern world. Facing the formidable enemy, he looked around, and his first words were thrown to the stunned researcher Su Xue: "Little girl, where are you? What year is this? ... You are so lucky!" However, in his seemingly refreshing modern life, Chen Shi was keenly aware of the scent of an eternal enemy. The dark turmoil and filth that he suppressed back then has quietly revived and spread in this era! "Oh, I was able to push him horizontally once back then, but now I can crush him again!" Chen Shi's eyes flashed coldly under his red hair. When global darkness breaks out, the ancient evil god awakens, and a new world-destroying turmoil sweeps the world... Chen Shi, the unknown emperor who was "accommodated" in his later years, will finally announce to the world: I am back! Top priority! I want to continue the imperial bloodline!