Without possessing the unique skill blessed by the goddess, a boy named Kujou Kyouya failed to save the world. He was ridiculed as a “failed hero” at the interdimensional-level academy where returned heroes who had saved many worlds gathered. However, he became the strongest and most unique hero, having trained for 30,000 years in another world with the most evil demon king, Felice, who has destroyed 3,000 worlds! Now Kyouya’s unique skill is so powerful that he cannot even be defeated by the strongest heroes! The legend of a boy trained by the most evil demon king, begins!

When there is no way out, the way is in.

Doomed to die next month, our terminally ill protagonist Chan is too frail and defeated to try anything at all.

No wonder he chooses to plunge himself into an RPG world he is only too familiar with.

Why should this run be any different?

Well, other than the fact that he will wake up inside the game and get struck with an existential epiphany that will make him fight tooth and nail to give Nox, his equally ill-fated RPG persona, a better chance?

Maybe, it’s not over until it’s over.

After losing his girlfriend to a brave hero, Toru is expelled from his S-Rank party. With a feeling of sadness and pain in his heart, he defeats a demon he meets outside the city, and his ability [to save experience] is broken! Toru becomes level 300 in the blink of an eye! With this power that far surpasses that of heroes, there is nothing that can stop him. Kaede, a slave he met on his journey, forms a group called the "Mangyu Brigade", and easily completes dungeons, acquires the legendary sacred weapons, and thanks to his skills, his friends level up easily! He rescued a countess who was attacked by bandits on the road, and befriended a legendary beast. Oru's journey continues at a leisurely pace, as he repeatedly encounters various people along the way, while his former party of heroes are deprived of opportunities to play an active role and fall into decline. This is the beginning of the life of a 300 level warrior!

Original Webnovel: https://ncode.syosetu.com/n9483ge/

Killed on the battlefield without glory to his name, Yuseong Dan receives an opportunity to grow stronger with a strange quest and level system. But each quest he’s forced to fight only seems to be getting harder and harder. Can he level up enough to avoid the same miserable ending and become the powerful hero he wishes to be?

The King's Avatar Manhua Adaptation Rerun.

Widely regarded as a trailblazer and top-tier professional player in the online multiplayer game Glory, Ye Xiu is dubbed the "Battle God" for his skills and contributions to the game over the years. However, when forced to retire from the team and to leave his gaming career behind, he finds work at a nearby internet café. There, when Glory launches its tenth server, he throws himself in to the game once more using a new character named "Lord Grim."

Ye Xiu's early achievements on the new server immediately catch the attention of many players, as well as the big guilds, leaving them to wonder about the identity of this exceptional player. However, while he possesses ten years of experience and in-depth knowledge, starting afresh with neither sponsors nor a team in a game that has changed over the years presents numerous challenges. Along with talented new comrades, Ye Xiu once again dedicates himself to traversing the path to Glory's summit!

Han Jee-Han, a normal high school student, suddenly develops a special power where his entire world is shifted into a game-like setting. He can see the power levels of people, look at the stats of a seemingly normal item, get abilities, and even level up! Follow Han Jee-Han as he discovers how to use this power, and maybe even where it came from.

Description from Line Webtoon:
What if your life is just like playing a game? What if you can upgrade your status and gain more levels? A fantasy world is coming right at you!

Just when Liu Jinshan thought he could die without regrets, his family was annihilated! As a result, he became determined to live just so that he could see his only surviving granddaughter, Liu Seol, reach adulthood. As he struggled to raise her and train her with his aging body, Liu Seol, who was born with the talent of a supreme martial artist, grew up much faster than he thought she would. "Don't worry, Grandpa, I'll protect you from now on!"

Due to an unknown error, Kim Kibong was trapped in the Awakening Test for 3000 years. In the real world, 10 years have passed, and it is overrun by monsters and dungeons.
The battle now begins for Kim Kibong, who returned with the max level, to restore the world back to the way it was!

On a harsh rainy day, a high school student without any particular special skills, Usato Ken got dragged into another world summoning with two others; a good-looking guy and a beautiful girl, both of whom he strangely started getting along with just today. As an especially talent-less individual that doesn’t stand out he internally thought that he would be treated as useless. However, the others were unexpectedly kind.

Usato who found hope in another world thought that, but the reality was different. He had a certain magical talent hidden in him and he was forced to fall into hell in the name of “training.”

The web manga centers around Bojji, a deaf, powerless prince who cannot even wield a children's sword. As the firstborn son, he strives hard and dreams of becoming the world's greatest king. However, people mutter about him behind his back as "a good-for-nothing prince" and "no way he can be king."

Bojji is able to make his first ever friend, "Kage" — a literal shadow on the ground who somehow understands Bojji well. The story follows Bojji's coming-of-age as he meets various people in his life, starting with his fateful encounter with Kage.

Mitsuki Kou is such a feared PVP gamer that he's earned the nickname "Crim the Headhunter" in some circles. His next game to take over? "Destiny Unchain Online", a brand new VRMMO game developed by none other than Kou's father. But, no new game on release day is without its bugs - namely, Kou glitches to the middle of nowhere, and his vampire avatar is turned into a girl! A story for all of the people who through games have met new friends and aimed for the top... start!

Ananta, a barbaric warrior cursed by a demon god. In order to punish the incarnation of the wings, who turned his fate into a tragedy, he endlessly feasts on demon gods in a story of blood, sweat, flesh, and bones that yearns for revenge.

Zero was mankind’s first real superhero. Under his watch, countless other superheros appeared and followed in his footsteps. However, after 5 years of war, Zero disappeared without a trace.

This is his 101st reincarnation!
Is this life a fantasy again? Another fantasy? Just as he is disappointed, he hears his mother's mumbling.
He is the youngest prince with no inheritance rights?
No one pays attention to him?
Hooray! This life is a piece of cake.
He is tired of saving the world or fighting desperately for ambition.
What does he want?

Only to enjoy the sweet honey!

The world's only one best CEO, Han Yoo Hyun. He leaves everything behind and relives his life!

Zhuo Yifan was a magic emperor or could be called a demon emperor because he had an ancient emperor’s book called the Book of the Nine Secrets, he was targeted by all the experts and he was even betrayed and killed by his students. Then his soul enters and comes back to life in a family servant boy named Zhuo Fan. Because some demonic magic is holding him back, he must unite the child’s memories and cannot ignore the family and the mistress he serves. How can he lead this descending family back to the pinnacle of this continent!

When the Devil King announces his retirement, he calls forth his two sons, Yomi and Sora, to give them each a quest. Whichever of them finds a pure Yamato maiden within a year would inherit the throne of the Devil King, while the other would die. Thus begins Sora's sex-fuelled adventure to find a woman that can satisfy his father...
(Sakigake!! Otokojuku Wiki)

As the red-headed princess of Kouka, Yona lived the ideal, though sheltered, life within the walls of Hiryuu (Red Dragon) Castle. Doted on by her pacifist and cowardly father, King Il, and protected by her childhood friend/bodyguard, Son Hak of the Wind Tribe, (who has loved her since they were kids, but keeps his feelings in check). She cherishes the time she spends with the "love-of-her-life" (and older cousin), Soo-won. Though, on the night of her 16th birthday, everything changes when she witnessed someone close to her, murder her father.

D-Rank non-combat raider becomes a great enemy of god that will save the world with the strongest restoration item.

This is no different from ordinary villager life...
"There can be no one stronger than me in this world!"
To become the strongest, Yuria, the Sea Queen, went ashore in search of the Demon King. But when she looked at her reflection, she saw the face of a child. In exchange for her legs, she lost all her strength... Even so, still striving to become the strongest, Yuria begins a painful journey!