MTL - Black Bellied President Dotes on Wife - Chapter 18 Calculated by people

Qin Xi had been reborn. She was reborn in 1983 when her family married her off to a fool, and she had accidentally inherited the Mysterious Doctor techniques on the day of her rebirth. She only had four bare walls of the house? She was bullied by others? Qin Xi looked down at her own hands and her medical skills and decided to start her journey of self-improvement. Since then, with silver needles in hand, she has not only cured her foolish husband, but she also schemed and kicked out her outrageous relatives, leading to her husband’s family becoming prosperous…After successfully becoming a wealthy woman, Qin Xi thought she could finally breathe a sigh of relief. However, her husband hugged her from behind and whispered into her ear, “Darling, we haven’t had children yet…”

In the winter of Taikang Year 3, a girl pays a visit to her future in-laws, the Ning Family of Beiliu, Yangcheng.

After her engagement was denied, the girl decided to hang herself in front of the Ning Family to show them her sincerity.

When the girl who had died opened her eyes once more, many people’s fates were changed forever.

- Description from Novelupdates

Some say reincarnation is a blessing, but for me, it's a dreadful curse. Cursed with endless reincarnation, I've been reborn as a villain 137 times. And all 137 times, I've been toyed with and killed by heroes who are far more cruel than the said villains... If I can't win no matter what I do, then I'll crush those so-called heroes at their very roots. - Quality Fan Translations, Made by Fans for the Fans - Villain Takes Over The Academy

What got summoned was the world’s strongest sociopath.