Ferrid's manga / #Zero to hero(25)

Reminds me of a trashy chinese level up manhua. The mcs character is pathetic, the art is so-so, the panel pacing is awful, and the story is meh. Mc had a system fused with his soul since birth. The system is a pay to play game like software that was absorbing his cultivation energy to power up. Because of the system, mc was weak and discarded by his rich family. Now with the system fully charged, he hopes to get stronger and win everything back.

A slightly less interesting version on solo leveling. Mc has to learn from his past lives to level up. He becomes an op jack of all trades. Artwork is less dynamic and mc doesn't have the same draw as solo level. Also, the story skips around a lot.

Loser programmer who likes to hide Easter eggs suddenly gets sucked into a post apocalyptic fantasy world that he helped create. Using his knowledge of the easter eggs, he cheats the system and levels up.

Mc opens his door one day to find an entrance to a dungeon. He cannot escape, the only option is to move forward with the other trapped adventurers only our mc decides to hide in his room. The days to complete the dungeon tick down until finally, the mc manages to tame low level monsters. He teams up with sentient skeletons from other worlds to beat the dungeon

Mc finds and ancient grimore that "curses" him with gluttony. He must consume books to aquire skills and sate the beast's hunger. If he doesn't find a satisfying magical book, gluttony will consume its host instead

Mc is hilarious to read but would be a prick to meet in real life. He was reincarnated as a baron's son with crippling debt and uses his modern day civil engineering knowledge to earn money and improve the lives of his people