Invincible! This person has lived for a billion years - Chapter 754 "Suspicious target detected!"

A good-for-nothing man married a beautiful girl but was kicked off the bed on the wedding night. Furiously, he wrote a bill of divorce and ran away.
He was schemed a car accident in which he nearly lost his life. However, it turned out to be a blessing. He swallowed the soul that passed through the outer world, thus obtained superb medical skills and martial arts.
Later on, with the silver needles and invincible martial arts, he embarked on the road of counterattacks and was committed to his great dreams.

- Description from Novelupdates

Leon was once an ordinary man—until he died saving children and woke up in a new world as the last prince of the demon race. But his awakening comes with a cruel truth: the war is already over.The Demon King is dead. The once-mighty demon empire lies in ruins. And now, Leon stands amidst the ashes, surrounded by a handful of survivors teetering on the brink of extinction.Crowned Demon King by default, he holds the title—but there is no kingdom left to rule. The few remaining demons are barely surviving, hunted and outnumbered. Worse still, Leon, who once enjoyed the luxuries of modern technology, must now navigate a harsh world stuck in the Middle Ages.Can he pull the demon race out of their misery? Can he reclaim the power they once held? Or will history remember him as the last king of a fallen race?Follow Leon on his journey to rebuild, conquer, and defy fate itself.

Kai is refused help from the president and thrown back into ground zero, where he meets a man whom he shows kindness to. As an act of repayment Kai is taken to the under tunnel of the city where he discovers a secret office belonging to his father. The stranger seemed to know what he was looking for after some time he handed over a box to Kai. A melodic robo voice came from the box -|DNA ACTIVATION VERIFIED|- -|ASTRAL NODE IS ONLINE|- -|SYSTEM HAS BEGUN ACTIVATING|- -|AWAITING MANUAL OVERRIDE TO TURN ON SYSTEM|- Kai is gifted a rare astral node and resolves to join the academy to save his dying sister from the F-X7 disease and also escape the life of poverty they were stuck in. -|PASSWORD CORRECT|- -|MANUAL OVERRIDE SUCCESSFUL|- -|SYSTEM IS UPDATING, PLEASE BE PATIENT|- -|SYSTEM UPDATE IS COMPLETE|- -|SYSTEM IS ONLINE|- Joining the academy does no guarantee his success since he has no powers. But he must survive since that has been his goal after being sold to slavery. -|USER: KAI HALSTEN|- -|RACE: HUMAN|- -|GENDER: MALE|- -|LEVEL: ONE|- -|EXP: 0/100|- -|HP: 10/10|- -|BEGINNING BONDING|-