Do Kyunwoo is the black sheep of his renowned swordsman family. He cannot even catch a rabbit on his own. On his first day of fifth grade, he meets a tranfer student and recalls his past life.

He had reincarnated into the world of a game he used to play called [Brave Hearts]. He was already frustrated that he had reincarnated as a loser, but on top of that, the transfer student is an intermediate/mid-tier boss who will destroy the world!

“Why are you being so nice to me?”

“Because I want to be friends with you.”

Do Kyunwoo’s plan is to become friends with the transfer student in order to prevent the end of the world!

In order to survive in this new world and to reach an ending he desires.
He becomes best friends with the mid level boss.

The story of the Red haired boy and the Braided glasses girl.

Orginal webtoon

The main character was possessed as Baeklee Yeon in the world of martial arts, the foolish and annoying daughter of Baeklee Ee-gang, a complete body and teacher who leads the male protagonist into the right path of becoming a hero.
She was killed unexpectedly, and when she opened her eyes, she regressed to her childhood days where she could undo everything.

I’d been stanning the hero for 3 years when I was suddenly caught red-handed by his tyrannical doting father, Duke Hades Louvremont.

“Ceaseless pursuit, expensive gifts, and now you’ve come alone all this way up north with no regard for your life…”
“I’m sorry. I have no excuse.”
“Alright, I’ve lost. Your devotion is undeniable.”
“...You think so too? Even I admit that this is the pinnacle of devotion.”
“Many women have pursued me, but none as persistently as you. I stand amazed. Let’s hold it, then. Our wedding. As soon as possible."
“Ha... Yes, I’ll accept my fate.”

Silence.

“Wait, pardon?! What?”

What did he just say?
Surely I must've misheard?
But the duke, smirking at my shocked face, gave the finishing blow.
“I said, I’ll marry you.”

Wow.
The hero’s dad has an inflated ego.

Duke Ferio Voleotti suddenly decided to adopt a daughter and finds a girl who he takes a liking to. This story is about a “loving” family of the world’s most richest, strongest, and arrogant father, his cute, blunt, muscle-loving adopted daughter, and a stepmother with a strange secret.

High school girl Akari mourns the loss of her mother who died when she shielded Akari from an oncoming truck a year ago. She discovers an adventure game her mother had gotten for her birthday some time ago, but never had a chance to finish. Suddenly, she is summoned to be the mother of the Demon Lord's 10 children in another world...

During the school trip Touka and his classmates are summoned to another world.
However, Touka was the only one with the lowest rank: E-rank — an extremely low status compared to his classmates. Thus, the former mob-character and abandoned hero, will absolutely become the strongest devil as he advances and strikes back.

Tower Defense & Dungeon Attack RPG
I saw the ending to the game no one was able to clear.
But, when I came to my senses, I was inside of the game.
In fact, I was in the tutorial stage, a place where strategy was impossible.
“I’ll clear this bullshit game no matter what……!”

I became the mother of 'Ainspanner,' who was presumed to be the final mastermind of this novel. I was supposed to be a bad stepmother who abused him when he was a child and eventually became the first to be killed by him when he became an adult. I was thinking of a plan to escape my tragic fate when I saw the young future villain and the naive, innocent look on his face. However…

"What an adorable child! He’s so cute I want to bite him! How could anyone abuse him?"

He was so cute that I couldn’t believe he would become a villain when he grew up. So, I decided. I will protect him. This way, he’ll save me too when he’s all grown up.

In the novel "The Emperor and The Saintess," the male lead and heroine were able to defeat the cursed dragons and the demons, as well as the final boss of the story, with their beautiful love.

"...Haha. I'd rather die now, so I can go in peace."

Rather than having a brilliant future and being hailed as a genius mage, I just want a secure future where I can have a comfortable retirement...
That's what I wish, but when this world comes to an end, I'm the final boss.

Please, just let me live....
However,

"Wait, isn't this the male lead, Siegren?"
"Why is he here?"

Siegren, the heroic male lead who will save the world, is dying right in front of my eyes?

The male lead whose mind and body were all tattered from rolling around in the battlefield.

"Siegren, I'm sure you'll have many things to do in the future."
"I promise to help you achieve that."

When I saw Siegren's wounds, I made a promise.

This person, who suffered because of the lines I wrote. I promise to bring him happiness, a brilliant future, and a comfortable life.

An unknown skill turns into unlimited power with divine knowledge [Internet]!

"To manifest an SSS rank with the weakest skill is a disgrace!"

Rona is a girl who was expelled from her home due to her lack of money, food, and power. Lost and hopeless, she suddenly hears the words...

"Would you like some guidance?"

She discovers how to utilize her unique SSS rank skill: [Internet], which she alone possesses. The true nature of this skill is the ability to access this world's 'guide sites' - an extraordinary cheat skill! Endless production of valuable items! Acquiring ultra-rare equipment! Thanks to her skill, she can do as she pleases...!

“25…that’s too old to become an idol.” Do Seohan, who got eliminated from the successful idol survival audition program ‘Stardust Project’. Giving up his dreams, he is trying to find his way working part-time jobs. When all of a sudden, he wakes up 8 years in the past after an accident. Right before the ‘Stardust Project’ started! As the youngest (but most experienced), can he make it to the final lineup this time?

25 years old unemployed Lee Juwon.
One day, he became a dad. "Dad...?" But... his daughter is too cute.

Can I be the strongest even without a goal?

The main protagonist, who progresses through the game while enjoying it at his own pace, will be recognized as the strongest. Instead of progressing through the main story at a typical pace, he would rather take the shortest path to conquer everything. The protagonist, without actually trying to become liked, gains popularity from NPC men, women and inhumane beings alike. Even among the serious moments that may appear, while everything is just one step from being destroyed by the protagonist, the game will continue to progress as a carefree paradise.

Shou-chan is a member of the public morals committee who wants everyone to have a healthy relationship, and is worried about his childhood friend Sayo. Because she carries the blood of a succubus, she often approaches her beloved her Shou-chan in any way to make him "lovey-dovey sex". As he persists in having a healthy relationship, which is full of lust and surrounded by questionable students, will Shou-chan manage to keep his sanity?

A short story about a countryside girl, faced against a truck.

I’m not sure why I decided to buy a medusa in the slave market, but since then she insists a lot that I remove the blindfold from her eyes. Is she trying to petrify me? Or does she really want to see me with her own eyes?

Man brings home succubus, doesn’t get fucked. Instead, gets a cute succubus to take care of him.

Late at night in the middle of my part time job at a convenience store, I had an encounter with a robber and was mercilessly stabbed to death.

As I was about to lose my consciousness, I thought about how much I wanted to do this and that when I heard a voice……

『The wish to be summoned has been confirmed. Granting Unique Skill 《Jack of all Trades, Master of None》』

Rude words such as that were said. Jack of All Trades, Master of None? Don’t screw with me!

Such thoughts and wishes were for naught as my consciousness faded, when I came too I was standing on a green foggy hill.

(no overpowered protagonist and no harem)
[Description from novelupdates.com]

This is a fluffy romantic comedy about a dull and quiet guy, and a very ordinary girl.