The Strong Beauty is a Goddess in Showbiz - Chapter 54 - : Her Angel Really Was a Devil in Disguise!

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

Avery Carter discovered that she wasn't her parents' biological child.After living with them for so many years, she discovered she was separated from her twin sister, during a fire at the hospital where they were born. In the chaos, the twins were switched, and she was sent home with the wrong family.She was a fake heiress.When their real daughter returned, she was abandoned and she was sent away to her barren birthplace.After returning to her real family, many people expect her to fall from grace, but she surprises everyone by lifting her biological family out of poverty.Rising to the upper class, she befriends celebrities and engages in battles of wits and courage with bitches and jerks.Now the most important thing for her is to draw a clear line with this dangerous billionaire, Alexander Moran, a businessman who arrived in the City on a mission to secure a deal with V Group and find medical help for his sister. However, meeting Avery turns his attention to her. He is fascinated by her strength and the way she handles everything thrown her way. The more he interacts with her, the deeper his admiration grows.What starts as a business venture soon takes a personal turn. Alexander is not only impressed by Avery’s professional abilities but also her charm. As they get closer, he finds himself wanting more than just a business deal – he wants to win her heart too.

“Impossible… Why are you not following my orders!? Clearly I sucked your blood, why!?”

On the very first day of high school, the youth subscribing to the philosophy of “absolutely ordinary everyday life,” Kujou Hisui, encountered disaster head on: He was attacked by Rushella Daamu Draculea, the vampire who had lost her memory. Rushella was greatly intrigued to find her vampire powers ineffective against Hisui. Not only did she make Hisui’s home her own, she even enrolled in his school to stick to him–

Hisui had no choice but to help Rushella regain her memory. But before one crisis could be resolved, many more had risen. With tempting advances from the mysterious Sudou Mei, and kidnapped by the girl from the Supernatural Investigations Section in search of Rushella, Hisui’s ordinary life has been replaced by its complete opposite, drama–

Romantic comedy and supernatural action in a school setting!