MTL - Summoning the Strongest Emperor of the Heavens - Chapter 2 system

After dying in the apocalypse, Su Jin was given a second chance as she was reborn into her former self just one month before the beginning of the end. Knowing that the world was about to fall apart, she started stockpiling everything she could. Her family started to think that she had gone crazy after her marriage and was ready to gang up to ruin the trashy husband. However, as the world suddenly changed around them, their air tickets and money were rendered useless and they now understood just how much foresight their beloved Su Jin had this whole time. As they continued to fight for survival, Su Jin’s husband scoured the city with several better-looking team members. One of them groaned while trudging ahead, This is the 212th time we’ve lost our way since the team leader began his search for his wife…

Jun Ye travels through worlds for unexplained reasons and is always cast in subservient roles. Unfortunately, that wasn’t his style. Let the counterattack commence!

- Description from Novelupdates

Jun Xiaomo, notoriously known as “Lady Demoness”, finds herself chained and bound in a dungeon. Her hard-earned cultivation has been completely crippled, and she has no means of escape. Qin Shanshan, a lady she used to called her “close friend”, mocks Jun Xiaomo, revealing that Jun Xiaomo had been used by the people around her. Even her lover, Qin Lingyu was one of the masterminds scheming against her. Jun Xiaomo watches her life flash before her eyes and realizes that she had indeed blindly placed her trust in people. Her naivety had led to her current predicament.

Jun Xiaomo wanted to end it all. However, she is determined to deliver a swan song. Over the hundreds of days tormented in that very dungeon, Jun Xiaomo had painstakingly painted a complicated formation array with her own blood. With a determined look, Jun Xiaomo burns her life force to activate the array. Her sole intent? To bring with her as many schemers to the gates of hell as she could. The bright red light from thearray intensified, and the end was nigh.

…or was it? Jun Xiaomo opens her eyes and finds herself alive again; time had rewound right back to when she was sixteen years of age, albeit only at the eighth level of Qi Cultivation. Armed with the knowledge and memories of her previous lifetime, Jun Xiaomo is determined to learn from her mistakes and bring retribution to those who so deserve…

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates