Itai no wa Iya nanode Bōgyo-Ryoku ni Kyokufuri Shitai to Omoimasu - Chapter 402

This book narrates the joyful cultivation tale of an ordinary commonplace university student and a cute and coquettish little fox.

In previous life, she was ignorant and naive. She was a “villain” owning a horrible reputation ever since childhood. She was framed by her friend, betrayed by her beloved, and ended up alone and died miserably. When she was reborn in the 1980s, she vowed to recognize the true nature of the people around her and work diligently. In this life, she would never let her younger sister die for her again. She will be an excellent female soldier, a pious daughter, and a qualified elder sister.Let's watch how she goes all in, saving her sister from great distress. She will turn the tide and lead her family through the reform and opening-up, striving for prosperity and a better life.

After breaking up with his girlfriend, he accidentally acquired a genius system and rose from there against the heavens, becoming invincible..

- Description from Novelupdates

The boy who Sneaks in My Bedroom Window