Before I Was Born, I Had Killed the Demon Prince

Most people will not remember when they were born. But what Sebastian remembers first is death. Reborn with complete memories, a ray of plundered demonic power entangled his soul. Compared with the initial career that others are competing for, he holds the most luxurious trump card - time. Even before he can walk, he can continue to test his own limits; when no one can solve his puzzles, he can reversely deduce the mysterious and unpredictable system; he also has to repeatedly consider how much of his true nature can be revealed to whom. In an isolated mountain outpost, he was raised by a fallen and shamed mage and his daughter. Bastian knew very well that his system panel must be kept secret. But cold numbers don't lie, and neither does the monster he devoured when he was still in his mother's womb. Deep in the darkness, the thing was still hungry. And the one who secretly watched his growth was far more than just this demon.