Toaru Majutsu no Index - Volume 20, Chapter 2: The Beginning of the Invasion and the Counterattack. Angel_Stalker.

She, a modern hidden ghost leader of an organization which gathered insane prodigies proficient in the various differing skill-sets. Highly skilled in medicine and poison, executes covert assassinations, viewed as insane and demonic in the eyes of people of the world. Killed in an accident, and reborn into the body of a disfigured young girl.

What? Face disfigured, identity stolen? A return to the family dim and hopeless? Her identity can be given up, her family can be forgone, but as for the one who harmed her predecessor who inhabited this same body, if she didn’t at least make them scream in unimaginable agony and throw them into a state of wretchedness, how could she live up to her demonic reputation? Endless turmoil ensues and it’s a battle to dominate over all! See how she shook the world dressed in a suit of red, her sword up against the dominant powers that rocked the Heavens! Her name spread across the seas, shocking the earth!

- Description from Novelupdates

At 20 years old, Su He married Mr. Jiang, a business tycoon with billions to his name, proudly hailed as a business mogul. Upon learning of this, people said that she, a country bumpkin lacking background and wealth, was merely a poor doctor with a beautiful appearance, unworthy of the esteemed Jiang family head. Gradually, however, people discovered that this 'poor doctor' with 'no background' was in fact the jewel of a prestigious medical family in the capital, an expert surgeon in the medical field, an heir to a medical research institute, and a mysterious designer... Everyone knew that within Mr. Jiang's heart, there was a cherished figure. As the four-year marriage agreement neared its end, the man handed her a document, his tone gentle yet assertive: 'Sign it!' 'A divorce agreement?' Su He asked, her eyes bright with unconcealed excitement and anticipation, having longed for a divorce. The man snorted coldly, 'Just sign it!' Not long after, Mr. Jiang reneged, stating: 'Since you've given birth to my child, you'll be mine for life!'

Jun Xie was the number one assassin in modern earth. His skills and knowledge in the field of assassination were unparalleled, his accomplishments unprecedented, his reputation terrified the entire underworld. However, during a mission to retrieve a mystical treasure, a mishap occurred…

He is now Jun Moxie, a sixteen year old super level debauchee, sole heir to the declining Jun family. A family of valiant heroes, left with an old grandpa, a crippled uncle and a debauchee as the sole heir! Accepting the world’s criticism and cold stares with a smile, his new journey begins! His life will be carved by his own will! Rise to the top! Evil Monarch Jun Xie!

“This cup I toast to those I’ve killed in my past life. Forgive me, for there is no chance for you to have revenge. Gulp!

This cup I toast to those whose life I will take in my new life. Forgive me, for you are fated to die by my hands. Cheers!”

- Description from novelupdates

Being adored by one's parents and hoping to achieve something that could bring them happiness, a child sacrificed their carefree personality and chose the path of books and knowledge at an early age.Without looking back to see how those they thought were their parents were, in truth, only pushing them from behind.Esme, a prodigy from an early age, excelled in everything, unlike her sister, who, though adored by both parents, always lagged behind.Finally, after saving the company from debts and restoring it to its former glory, Esme looked back at her parents in hope of recognition but...“You are not even my daughter, you pathetic fool.”“Hehe, Sister, how about I take your fiancé?”“Um, you see, Esme, I love your sister.”“Tch, insect, how dare you reject checks whenever I, your mother, asked for money!”Those words lingered in Esme's mind before she lost consciousness and woke up inside a prison.“What are you doing here, Aron?” Esme looked at a handsome young man seated in a wheelchair, gazing at her with amusement. He was her sole business competitor, and now, he was visiting her in prison.“Nothing, just came here for a proposal, Miss Esme...”Let's see what awaits the journey of an heiress who was wrongly accused of being fake, betrayed by her fiancé, and had to seek support from her business rivals.