Suterareta Yuusha no Eiyuutan - Story 3-16:『Failure』

On the day I went to the hospital for an abortion, I met my husband holding his ex-girlfriend. That woman was just suffering from menstrual pain, but he was taking great care of her and being very gentle.He said, “I never thought of marrying you, so please behave yourself.”He said, “You are just a scheming and fickle woman. How could you bear my child?”I sneered and decided to abandon him!After the divorce, that woman showed off their engagement ring to me. Then, I pointed at the man who had just walked into the hotel and said, “Let me introduce. This is my new boyfriend.”Since then, this tycoon, who was only temporarily working as a doctor out of boredom, somehow got a girlfriend who had come to him for an abortion.

Ed was transported into a world of Hunters, a harsh and extreme environment.In this world, winter days last only two hours, and even in summer, the daylight barely stretches to six hours!What makes it even more eerie is that when night falls, all creatures of various races turn into violent, frenzied monsters. Evil spreads everywhere, and the night itself becomes humanity's worst nightmare!Hunters, however, can only train through the Sunlight Meditation Technique, using the brief daylight hours to cultivate their strength.But Ed awakens the Moonlight Meditation Technique!From that point on, while others flee from the night, Ed thrives in it, growing stronger and stronger with each passing day!He slays dark sorcerers, exterminates vampires, and defeats the Wolf King!Gradually, Ed becomes the strongest human to ever exist!

He Lang died by his own hands for the sake of his imperial younger brother’s ambition, whom he loved. He was offered to be reborn in exchange for giving up his past romantic feelings. Reborn without the burden of his romantic feelings, he brings with him a manual to new worlds. He wholeheartedly followed the instructions of the manual to complete the tasks, not knowing that the originally slag gong was blackening…
He pleaded to his affectionate Emperor brother to release him, he pleaded to the paranoid prisoner next door, but until the end he remained baffled.
In the end, he discovered that the full name of the manual was – “Slag Shou Cultivating Manual”
Σ (っ ° ° °;) っ!

- Description from Novelupdates

An Hao leaped, thinking she had died, but to her surprise, when she opened her eyes, she found herself back in the year 1985. To live a second life, did she have to endure the abuse of her stepmother and stepsister again, the dislike of her mother-in-law and disdain from her sister-in-law, and the betrayal of her best friend who bravely became the other woman just to slap her in the face and climb the social ladder? Was she supposed to end her miserable life in poverty again? An Hao's answer was, “Eat! Shit! No!” She was determined to make something of herself, to get rich by capitalizing on her knowledge and aim for a well-off life. This time around, she was going to be the protective big sister who reformed her worthless little brother who had died a wretched death, and the virtuous wife to make up for her past neglect of her husband! She wouldn't let this life go to waste in despair! A malicious best friend? Coveting her man? Not a chance! Go hang out wherever it's cool! Cough cough, how did she not realize in her past life that this “Stoic King of Hell” was so indecent. Decent? You've had your fill of decency during the day.