MTL - Ninja School Teacher, I Can Become Stronger By Teaching - Chapter 52 There are also gaps between teachers (seeking further reading)

Qin Tian accidentally transmigrated into a sickly body, a body with broken Dantian that was unable to practice Qigong, in another world. Fortunately, God had mercy on him by giving him a level up system. Useless? That was him in the past. Not worrying about practicing Qigong, he was now able to kill Monsters to level up. Easy! Level up when killing Monsters; level up when killing people. An unbeatable sovereign of the clan in the eyes of other people, but in his eyes, he is a glittering big BOSS.

In the 21st century, she was the strongest bounty hunter who possessed supernatural powers and was proficient in brewing all types of potions. However, she becomes the first talentless child of a cultivating family when she transmigrates.

Madeline Celeste d'Aumont is the first daughter of Duke Aumont and Duchess Louise-Marie d'Aumont who has been engaged to the Second Prince of Pays Des Abrutis since she was a child. The Second Prince decided to marry a woman closer to his own age and broke off the engagement to Madeline who was left with a broken heart and a reputation as being an unwanted woman even before she was an adult. The Duke decided to help his daughter regain her confidence and reputation by sending her to the Academy de L'échec.

Ito Aoi was the son of a Kendo master who ran a dojo in downtown Tokyo. One day while crossing the street to get some Yakitori, Aoi was hit by a delivery truck and woke up as the trash first son of Duke Montfort, Guy de Montfort. Duke Montfort also sent his son to Academy de L'échec only Aoi instantly recognized that he was now living in the world of an Otome Game that his sister loved to play and talk about all the time. Aoi recognizes that Madeline is the villain from the game. Aoi also recalled his sister saying that Madeline was terrible in the game, but is she really?

[CRIME/OMEGAVERSE]Was it possible for the devil to get his own happy ending?A major accident seven years ago had stolen He Juan’s memory away from him, wiping it so clean that the only things he were left with were only his name, numerous scars all over his body and a nasty side effect as a result of the aftermath.Seven years passed by and when He Juan thought he could live like a normal person again, a fateful day led him to be the prime suspect of the murder case of his neighbor who had written his name as her dying message — whom, in his defense, he had not even talked to!It was then that he met Mu Yuze, the lone wolf of the Violent Crime Investigation Unit; the cold, intimidating man with beautiful and intense midnight blue eyes who seemed to hate him at first sight for some reason He Juan couldn’t comprehend.One after another, bizarre cases intruded on He Juan's normal life and turned it upside down, bringing light to a dusty past he thought he could never remember again. In the end, he had to learn that even if he had forgotten who he once was… there were still some sins he had to atone.***Gentle, klutzy and smiling Alpha whom nobody dares to offend for some mysterious reason x cold, possessive and cinnamon roll Omega (maybe a little yandere here and there)Additional tags: top/gong/seme protagonist, action, case-solving, organized crime, thriller, gore, slice of life, tragedy, detectives, disabled characters, murders, teamwork, investigation, yaoi, mature, past plays a big part, 1 vs 1, love interest falls in love first