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!

The girl I fell in love with is… an alien!? I, the class president, happened to fall in love with my classmate, the eccentric Haru. I confessed my feelings, but her true identity was an extraterrestrial who came to Earth to survey it. “I still like you!” I started going out with Haru, but I have a further “secret” to keep…

Ao Sato is accidentally swapped with himself in a parallel world with a male/female ratio of 1:39.

He finds a kind family and lovely women at the place where he was switched.

Seeing the outside of these women, he's relieved to see that the number of men and women has changed, but not much else.

However, their inner lives are filled with conflicts and troubles.

From Esthétique:

Arianrhod is a young girl from an island called Erin. She is different from all the other kids her age. All the others in the tribe have blond hair while Arian is the only one with black hair and because of this she was bullied many times. One day a traveler in silver clothing came to Erin and “named” Arian. To be named is very important because it reveals one's true self. After that the Master Drisu takes Arian in as his disciple because she was “named” by the stranger. Balor is the evil leader of Death Valley and one night he murdered all the people in Arian's tribe, and she swears to get vengeance on Balor.

Until recently, I had three wishes that I could only hope to come true.
 
‘Please let my missing oldest brother come back.’
‘Please let my Second Brother awaken so he could stop working as a rift porter.’
‘And my youngest brother…As long as he can open his eyes…’
 
There’s nothing I wanted but happiness… was what I thought…!
 
“Keuhk…I’ll only play for 10 years so I can keep the darkness inside me, so work a little harder, youngest!”
My oldest brother spoke as though he were still in his adolescence.
 
“Since hyung is playing for 10 years, I’ll also play for 10 years, too!”
My second brother who returned as an awakener from the future (as he claims to be) said.
 
“You foolish pig, I’ll give you an opportunity to serve this noble soul.”
My Third brother… let’s just move on since it makes my head ache just by thinking about him.
 
“You unemployed parasites! Why can’t you all go out and find jobs?!”
 
Can the future of Lee Bobae, a girl with nothing more to wish for, be full of happiness?

Her best friend and her husband cheated on her. If that were not enough, he killed her, his terminally ill wife. Ji Won, who died like that, miraculously returned to ten years earlier. In order to change her future, Ji Won pledged to hand over her ill fate to her "best friend" Soomin.

'So, marry my husband instead of me.'

One day, in front of my eyes appeared a silver-haired Goddess.

[Heaven-defying Star. The existence that goes against destiny. The one and only savior of a world that was destined to meet its end—]
What kind of bullsh*t is this woman spouting?

[You must be a regressor.]
“…What?”

No, I’m not.

A boy who used to be abusive to girls wakes up one day as one.

“I'll go back being a boy soon,” he thought, however that was not the case. Follow Akira as he grows and learns little by little to accept the puzzling changings in her surroundings and her heart.

One day 's lunch break, suddenly a male high school student Yuzo Ogata being transferred to another world of sword and magic together with four other friends.

According to the Princess of Space-Time Magician, a foreign world who summoned them, they want them to beat the Demon Lord as Heroes to save this world.
Suddenly I was surprised at four friends "Temple", but it was a relaxing expression ... ... where the princess told of a startling fact!
"`―― There should only be four braves though?"
"A man who was mistakenly summoned to a different world" What will be in store as to his fate?

Source: http://konomanga.jp/manga/taitei-cheat

This is a world where evil creatures are gradually rampaging. However, the evil creatures are strong, they all disappear after this mental hospital, and even without dignity, they are reduced to ingredients and pets. This is the Green Mountain mental hospital, where talents are abundant and strong people are surrounded. In this regard, the seriously ill Lin Fan, who is carrying the system, said: I am definitely not a mental patient, I am a normal person who likes to cultivate. Usually is to touch the socket, climbing high voltage box, thunder days standing on the rooftop to the heavens dance a stick method.

1000 years ago, the MC became a normal zombie in the apocalypse. In order to survive the constant hunting of humans, he continued to train himself until he became immensely powerful. After 1000 years passed, he is now ready to enter human society again.

In his past life, although too weak to protect his home when it counted, out of grave determination Nie Li became the strongest Demon Spiritist and stood at the pinnacle of the martial world. However, he lost his life during the battle with the Sage Emperor and six deity-ranked beasts.

His soul was then brought back to when he was still 13 years old. Although he's the weakest in his class with the lowest talent, having only a red soul realm and a weak one at that, with the aid of the vast knowledge which he accumulated from his previous life, he decided to train faster than anyone could expect. He also decided to help those who died nobly in his previous life to train faster as well.

He aims to protect the city from the coming future of being devastated by demon beasts and the previous fate of ending up destroyed. He aims to protect his lover, friends, family and fellow citizens who died in the beast assault or its aftermath. And he aims to destroy the so-called Sacred family who arrogantly abandoned their duty and betrayed the city in his past life.

Ronan lived a wasteful life filled with regrets. A second chance befalls him at the end of his futile life. He went back to the time when he was a ten-year-old child! For the people who sacrificed themselves for him, he becomes determined to live a new life.

Devoid of professional skills, unemployed Yu Damduk was forced to take a part-time job. Frustrated with his pathetic life, he vents to the gods, gets stricken by lightning and passes out.
[Hiring] God is waiting for you.
When he wakes up, he finds a status window floating before his eyes.
Since I have nothing to lose anyway, let’s go with the flow…
Jumping into God’s Part-time world to have a better life, the adventure of Yu Damduk, who became the lowest-class God in the part-time world, begins!

Eunho, the strongest in the yokai realm!
He gained the chance to become a human being after losing the woman he loved and killing countless yokai.
After passing the gate of reincarnation by accumulating merit for a thousand years to abandon his immortal body…

He became a human being, held a sword, and learned martial arts for the first time.
But this is very… easy?

From 87 Percent Translation:

Reiji Saeki living in the north eastern countryside town lost his life in an accident during summer vacation. .....But before he knew it, a mysterious ball of light exist in front of his eyes in a world of whiteness. Being a magician from a parallel world, that ball of light is looking for someone qualified to inherit the magic they had created to prevent it from being lost. Reiji who took on that suggestion lives in the parallel world, Elgin, with a new body and powerful magical power.

After giving up his dream as a boxer, Park Kang-tae joined a gang. He was well-known inside the gang but got killed in the end. He had one regret when he died―Giving up his dream as a boxer. Did God know about his regret? In a world, where boxing exists in the form of pugilist games, Park Kang-tae pursues his unfulfilled dream.

“You have been chosen as a player in the great game to select the next god’s successor, the Mission! Congratulations!”
Seonghoon has suddenly fallen into another world to participate in a game to become a god. This other world that is akin to that of a game contains players who cooperate and also kill each other in cold blood…!!
Seonghoon, a person without an ounce of talent, uses wicked and crude tricks to become an all-powerful player!

Akashi Eito has failed miserably on all high school admissions exams but somehow, he receives a letter of acceptance from a school he does not remember applying for. He nevertheless happily enrols, expecting to live the ideal school life, but his aspiration are quickly destroyed as he discovers that this mysterious school is a training institution for secret agents!

Immediately, Eito wants to return home and live a normal life with his normal family, until the director of the school makes a shocking revelation: Eito's deceased father was also a secret agent! He subsequently wants to know more about the past and memories of his father, so he decides to stay in this school. However, as a student of this institution, Eito will have to face a deadly exam made to test the skills of all new students...

Follow this story of action and espionage, in which our hero, who lacks physical strength, compensates for it with great bravery, and captivates everyone around him with the power of his courage and friendship!!

A young man who had surely died in an accident, was reborn in another world as a baby! After that, he was picked up by the patriot hero "Sage" Merlin Wolford and was given the name Shin. He was raised as a grandson by Merlin and soaked up Merlin's teachings earning him some shocking power however, when he became 15 his grandfather Merlin said: "I forgot to teach him common sense".