Powerful MC's

This is a development that I know of.’ The moment he thought that, the world had been destroyed, and a new universe had unfolded. The new life of an ordinary reader begins within the world of the novel, a novel that he alone had finished.

Love this.

Kaiden - A mysterious ability user who hides inside the body of a street cat. He is later picked up by Jiwoo after being injured after a fight with another ability user. He has a stubborn and bossy personality. Jiwoo - an energetic and talkative high school boy who loves cats. He is very kind and also seem to have a special ability.

:D

[Dungeon Reset ]
Once it starts up, the dungeon goes through a process called “Reset the Next User”. Why doesn’t this reset process apply to me ?!I am the only one left from that endless reset of this dungeon. With simple skills and an overwhelming weapon, Jung-down game starts inside the dungeon

As Shin Youngwoo has had an unfortunate life and is now stuck carrying bricks on construction sites. He even had to do labor in the VR game, Satisfy!
However, luck would soon enter his hopeless life. His character, ‘Grid’, would discover the Northern End Cave for a quest, and in that place, he would find ‘Pagma’s Rare Book’ and become a legendary class player…

The MC is transported to the world of a book he read, but he ended up possessing the body of a stupid villain who is fated to be killed by the main character. He's gotta do something, and do it fast.

One day the world became a game. Monsters are suddenly appearing and killing humans and humans have become players and must fulfill quests! A player that was given a second chance after the fall of mankind, Kim Sehan. Will he be able to beat the system that made the world into a mess?

Yu Ijin was the sole survivor of a plane crash when he was little. After becoming a mercenary to survive for 10 years, he returns to his family in his hometown.

Hobin, a bullied student unintentionally came upon an old NewTube channel. From that moment onwards, his life changed. How will he learn how to fight and make great content?

I had been abroad to do medical volunteer work, when I was swept up in a civil war. I was killed by a rebel soldier, while taking a bullet for a patient. But when I finally woke up, I had become a child?!?
And in front of me stood a destroyed carriage and a group of oddly dressed people, who were unconscious!
“It’s just like a Murim world.”

And then he ends up saving the MC of the book.

Kim Jihyun, who lived his life as a disreputable surgeon, gains a second chance to relive his life. He then goes back to his middle school-days, and live his life to the fullest unlike before, he studies nonstop. His goal is to become a dermatologist who make lots of money instead of the poor surgeon he was from previous life!