I'm Crazy About Upgrading

Chen Lin, an ordinary person with a gene development rate of only 5%. In this evolutionary era where adventurers are a privileged class, ordinary people are the weakest people in the world. Unable to become an adventurer, he became an illegal adventurer, fighting with all his strength in the maze just to pay for his sister's tuition, until he accidentally stepped into the "God's Burial Ground"... You have successfully activated... When he woke up again, he had become a strong man with a plug-in system, the "most pitiable" protagonist in the endless world. The system was bound to the weakest profession, and upgrading all relied on experience, um... What does it matter? Just kill him and that's it! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.