Cosmic Paragon - Chapter 16: The Twins

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

After transcending to a new world, Ye Xuan miraculously obtained the Swallowing System.

An unknown disciple from a small sect battling against the strongest in the cultivation world! The long journey working at cultivation, the realization of destiny and the chance to reach the apex of the world.

Some are born great, some achieve greatness and some have greatness thrust upon them. Zuo Mo is a zombie faced low level cultivator in a minor sect of a little world. Ever since he was picked up by the sect leader two years ago, he has no memories of his earlier life except a recurring nightmare. Navigating the rigid class structure and intricacies of the cultivation world, as one of the lowest possible of the lowest class, Zuo Mo’s dream is to earn money, and lots of it, through being a spiritual plant farmer.

A chance occurrence reveals that someone powerful had changed Zuo’s features and erased his mind. The money grubbing zombie decides to set out on a journey of cultivation to find out answers. Fate colludes with chance, the drums of war are beating, the ghost of his past is coming… …

- Description from novelupdates

I became a scientist for an evil organization.…But I’m too competent.