Dragon King's Son-In-Law - Chapter 780: The No. 1 Killer in the World!!

A man who was once called the world’s strongest agent ended up becoming a teacher after his retirement, to train a new generation of agents. After many years of training his disciples, he was killed at the age of 60 by a secret organization’s ruse and was reincarnated in another world with his memories intact. Though he was surprised by the existence of magic and the strange species in that world, he quickly adapted to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his rigorous discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life. This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

Grayson is a poor college student, scavenging leftover food, betrayed by his girlfriend, and constantly looked down on by everyone around him. Little do they realize he’s actually the heir to the mightiest billionaire family. When the seal on Grayson’s fortune is lifted, he transforms into the ultimate second-generation rich kid. He only wants to keep a low profile, but fate just won’t let him!So you think I’m just a loser? Fine. I’ll quietly use my money to solve everything behind your backs. Then I’ll make you all choke on your own words, swallow every insult, and slap you hard in the face...（This is anovel full of twists, comebacksand face-slapping moments, witha tightly woven and engaging plot—definitely worth your time.If you enjoy my story, please support it by adding itto your favorites. Your encouragement is the driving force behind my continued creation of exciting contentI also promise there will be no disappointing ending—the storywill have a satisfying conclusion. As the author,I already have 1.5 million words in reserve and willupdate with at least three chapters daily on average.）

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

When I died I meet with this being who offered me a new chance at life, to actually become someone important and I agreed and was reborn as none other as the First Man.But to think that everything that I ever knew was nothing more than a lie, what am I going to do to survive in such a world?