Master of Kaidan - Chapter 511 Game Begins

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.

She was a medical expert, talented and beautiful. She was reborn as his little wife. Her in-laws did not like her, her husband did not love her, and she was as timid as a mouse. She was weak and easy to bully.

After her life ended, Nan Fei Yu was bonded to a Villain System. In order to complete the system’s tasks as soon as possible and reshape her body, she became a villain that everyone hated. Everyone wanted her to die! However, if the villain was delicate and soft, did it bring an alluring hallo?

- Description from Novelupdates

After being betrayed by her fiancé and her cousin sister, she accidentally rescued an elegant but indifferent young master. Never did she expect to marry him and surprised many!