From Tokyopop:
Minami Fujii is an employee at a high-powered advertising firm. She’s good at her job but finds herself torn between the pressure and expectations of her career and her attraction to two of her coworkers: the younger, arty Ishida, and the classy, put-together Ogiwara!

One day, Kim Jiyong, an ordinary student, dreams of Jung Jihye and falls in love with her at first sight. But when he tries to find her... it turns out that the woman committed suicide 2 years ago?! The romantic story of Jiyong who wants to return Jihye's life, Please Show Up!

The Devil King whom I defeated in my past life is now my boss in the office?!

Baek Young-woong (meaning hero in korean), an ordinary office worker reborn with the memories of his past life as a warrior who defeated the devil king! The memories were only useful when he used to write webnovels as a child.

Young-woong regrets having useless memories of his past life and gets a job in the executive secretarial office of Daeryong ENT, a big company.

However, after meeting the CEO, Do Yeon-hwa, for the first time, I feel the trauma from my past life experience…? It’s like, you’re facing a really strong and big devil…!

Read the terribly intertwined romance of the devil king, the CEO and the warrior, the newest secretary!

I transmigrated inside the novel of my favorite character, the second male lead.
A tsundere who listens to all the words of the female lead while grunting, with a straight forward personality, and a handsome face.
Matching all my preferences, he was even single after the ending.
Nice! I’ll pick up the second male lead!
However, I overlooked one thing…
The tsundere, who had been abandoned by the female lead blackened, and had become a terrifying man!
“Get lost.”
…I-is it safe for me to pick up the second male lead?

Based on the Original Webnovel (https://series.naver.com/novel/detail.nhn?productNo=4880443) by Hwang DoTol

Jieum Ban has an extraordinary ability: she can remember the memories of all her past lives. After her previous life is cut short by a tragic accident, she sets out to reconnect with the people of her past life in her current one. Will memories of her 18th life sabotage romance in her 19th? Or will love endure across different lives?

From JManga:

Shio Asami, the wealthy daughter of a famous, deceased opera singer, aims to follow the same path as her mother. Moe Midorikawa, a young woman working several part-time jobs, dreams of becoming an opera singer as well. What will happen when these two meet?!

Story about a novelist and his daughter, Chise-chan, elementary school girl in Tokyo. Because Chise's mama died when she was very young, papa takes care of her. She loves papa so much that she carries papa's photo at a magazine interview instead of the idol stars' photos, and she's very happy that her papa's working at home because that way she can be with papa almost all the day...

Leah Hildebrandt was a strong knight who fought and served her country well— leading her troops to many victories. After the death of her parents, Leah now leads her life as the eldest daughter of the Hildebrandt family and is well known In society for her beautiful appearance and good manners. The only problem is that her brother, Richt, who was the heir to the family, left one day leaving behind a letter saying that he will return once he becomes a great man. Since it’s not known whether Richt is dead or alive, Leah decided to find a political marriage partner to retain her family’s position. However, something that starts as a mere political trick turns out to be fate!

Paw pads wrapped in white fur. Fluffiness around the neck. A bushy tail. A rounded figure that was the very definition of fur ball! ――A certain Japanese girl had been reincarnated into such a fox cub; Milfiria.
Milfiria was told to watch the house by her mother, as the mother left for the capital. However, unable to bear with the loneliness and deciding to chase her mother to the capital, Milfiria became lost in a fort protected by strong knights.

An autobiographical manga about Itagaki Paru, her two older sisters, mother, and father.

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.

Due to a mistake one night, I became the target of the most obsessive man and a villainess!

After possessing Ripley, a count’s daughter and an extra in a novel, I became the female lead. Since this is the case, I will try to enjoy the riches and luxuries of a nobleman that I couldn’t experience in my past life.

I can remember up to drinking alone in a corner at a party… but I woke up the next day in the male lead’s bed!

Ripley became the target of the villainess after the male lead’s remarks that she should be responsible for spending their first night together. Knowing the fate of the female lead, Ripley tries to get rid of the male lead by causing trouble, not washing, and all sorts of things. Nevertheless, the male lead’s unwavering single-minded heart begins to shake.

Based on the webnovel written by HWANG DoTol with insert art by MSG

An experienced Witch is ordered to teach magic to a gifted lonely boy captured by the church in modern-day​ Edinburgh, Scotland.

Akasegawa Naoya's mother remarried recently and he suddenly finds himself trying to get along with his new big sister Amane, a student of the prestigious Kasugano Girls' School. But his new big sister isn't like what you might first expect.

Crushing a scumbag for a single moment gives momentary satisfaction, but lifetimes spent crushing scumbags provide lifetimes of continuous satisfaction. Su Lüxia, our female lead, transmigrates into other worlds with the Second Female Lead Counterattack System, and uses elaborate schemes and tricks to beat up countless cheating bastards and bitches.

Su Lüxia: "Only a cheating bastard's tears of remorse, and the pained moans of a bitch unable to get what she wants, bring me solace."

System: "Has my host tapped into her humanity today? Nope."

Blondina, a princess who had commoner’s blood, lived quietly in a separate palace. Due to her mixed blood, she received ill-treatment and was surrounded with contempt. One day, she happened upon a wounded black cat and decided to treat it. But, the lovely cat she assumed it to be was actually…?

“If you run away like that, of course, I’d want to hunt you.”

Amon’s lips gently wandered down her skin.

“You’re the one who picked me up. You’re the one who kept me by your side.”

Amon whispered, as his feverish breath made her skin crawl.

“So you have to take responsibility for me till the end, Bridey.”

Once the lovely cat was all grown up, she realized… She thought she raised him well, but she's going to be eaten up as well.

I‘ve made up my mind. If I can't be an empress here, I'll be an empress somewhere else. The popular web novel Remarried Empress has been adapted to webtoon!

A young girl named Rahzel is booted out of her house one day by her father with the instructions to 'see the world.' And so her journey begins. However, she won't be doing it alone... for she befriends a stoic young man named Alzeid seeking revenge for his father's murder.
Alzeid and Rahzel are like oil and water... but even still, they feel strangely drawn to one another. This could be either the result of an underlying attraction -- or their shared powers with magic. And so, the two reluctant allies travel from town to town, using their powers to help the helpless, while discovering their own respective places in the world.

Count Casarius fell victim to a plague and died suddenly, leaving behind a will stating that Rietta, a beautiful young widow of the manor, whom he tried to use as a concubine, be buried alive alongside him. Just before Rietta is buried, Archduke Axias, rumored to be a cruel tyrant, arrives at the funeral to collect the enormous debt Count Casarius still owes him.

"Everyone here seems to feel sorry for her, and I still have a debt to collect from Casarius… If I take her instead, I think all of you here should be happy," he smiled, "Hello, my temptress."

After an accident, Eshana Ash has started seeing people’s lifespan. The date and sign of the person’s death would appear above their head. If the letters were black, she could help, and sometimes save the villagers from danger.

“It’s better not to go to the lake today. It’s too cold for going boating,” she said.

That man was to die today by drowning in the lake. She saved many of her people this way, so whenever she did, the people in her village would gather around and praise her and would tell her.

“You really must be a child from heaven!”

Well, I’m not particularly blessed to see death. However, if there is something that cannot be changed, it’s the lifespan shown in red.

“Save me.”

422 years of the imperial calendar, a peaceful evening. A bloody man lying in the front yard of the house. And clearer than that blood, is her lifespan.

[427/Sign: Eshana] Why is my name there?